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N3How you sound · Sep 28, 2026

How to say "let loose" in Japanese: 羽目はめを外はずす vs 調子ちょうしに乗のる vs はしゃぐ

羽目はめを外はずす (hame wo hazusu) means to let loose, cut loose, or go overboard — usually at a party or after drinking, when someone drops their usual restraint. 調子ちょうしに乗のる (choushi ni noru) is getting carried away or cocky, and it's almost always a mild criticism. はしゃぐ (hashagu) is just being boisterous or excited, usually friendly and without judgment (はしゃぎすぎ, "overdoing it", is where it turns into a mild criticism). English "let loose" or "get carried away" blurs all three together.

Tell someone they 調子ちょうしに乗のった when you meant they were just はしゃいだ, and you've turned harmless excitement into a subtle accusation of overstepping.

The basics

羽目はめを外はずす: letting loose, going overboard (usually at a party)

羽目はめを外はずす (はめをはずす, hame wo hazusu) is the standard idiom for dropping your usual self-control, most often tied to drinking or a party atmosphere. The most widely cited origin is 馬銜はみ (はみ), the bit in a horse's mouth: take it out and the horse runs free. 羽目はめ is a later spelling. It's one of many body-and-object idioms covered in Japanese idioms (慣用句かんようく).

飲み会のみかいで少すこし羽目はめを外はずしてしまった。 — I let loose a bit at the drinking party. (mild admission, usually not deeply regretted) 今日きょうは無礼講ぶれいこうだから、羽目はめを外はずしていいよ。 — Today's a no-formalities party, so feel free to let loose. (explicit permission to drop restraint)

羽目はめを外はずす almost always implies there was a restraint to drop — normal manners, workplace hierarchy, sobriety — and the fun is specifically in temporarily setting that aside.

調子ちょうしに乗のる: getting carried away, getting cocky

調子ちょうしに乗のる (ちょうしにのる, choushi ni noru) describes someone whose confidence or excitement has run ahead of what the situation calls for — they've overstepped, gotten cocky, or presumed too much. It's usually said with mild disapproval.

一回いっかい勝かっただけで調子ちょうしに乗のるな。 — Don't get cocky just because you won once. (a warning against overconfidence) 彼かれは褒ほめられて調子ちょうしに乗のっている。 — He got carried away after being praised. (implies he's now acting a bit too pleased with himself)

Unlike 羽目はめを外はずす, 調子ちょうしに乗のる isn't specifically about a party — it applies to any situation where someone's behavior has outpaced what's appropriate, from sports to workplace praise.

はしゃぐ: being boisterous or excited, usually no judgment

はしゃぐ (hashagu) is just lively excitement — loud, energetic, often associated with kids or with adults briefly acting like kids at something fun. It is usually neutral to affectionate; criticism only comes in with はしゃぎすぎ or いい大人おとながはしゃぐ.

子供こどもたちが遊園地ゆうえんちではしゃいでいる。 — The kids are having a blast at the amusement park. (purely positive, no restraint being violated) みんな花火はなびを見みてはしゃいだ。 — Everyone got excited watching the fireworks. (shared, innocent excitement)

はしゃぐ is the word you'd use for a group having genuine, uncomplicated fun — there's no sense that anyone's crossed a line. When the whole party's energy is the subject, the word is 盛り上もりあがる, as in 昨日きのうのパーティーは盛り上もりあがった, and excited in Japanese contrasts it with はしゃぐ, which is about the people being giddy.

Beyond the basics

無礼講ぶれいこう: the occasion that officially permits 羽目はめを外はずす

無礼講ぶれいこう (ぶれいこう, bureikou) is a specific, named social occasion — usually a company drinking party — where normal hierarchy is explicitly set aside for the night, and everyone is invited to relax without worrying about rank. For the full picture of this drinking-party institution, see nomikai and 無礼講ぶれいこう.

社長しゃちょうが「今日きょうは無礼講ぶれいこうだ」と言いった。 — The president said, "Tonight, forget the formalities." (the explicit permission that makes 羽目はめを外はずす socially safe)

The relationship matters: 無礼講ぶれいこう is the announced occasion; 羽目はめを外はずす is what people then do once that permission is granted.

のりのり: being fully, enthusiastically into something

のりのり (nori-nori) is a casual, upbeat way to describe someone who's totally into whatever's happening — energized, enthusiastic, riding the mood. It overlaps with はしゃぐ but focuses more on enthusiasm for a specific activity than on general boisterousness.

カラオケでみんなのりのりだった。 — Everyone was totally into it at karaoke. (enthusiastic engagement, positive)

のりのり is closer to "totally in the zone" or "really feeling it" than to any idea of overstepping a line.

Where you will hear 羽目はめを外はずす

羽目はめを外はずす is the phrase for festival nights, year-end parties and trips: the "rules are off tonight" feeling (無礼講ぶれいこう, festivals, 忘年会ぼうねんかい), as distinct from someone who is simply loud (はしゃぐ) or overconfident (調子ちょうしに乗のる).

お祭まつりの夜よるは、みんな少すこし羽目はめを外はずす。 — On festival nights, everyone lets loose a little. (the socially-sanctioned exception, not everyday behavior)

Common mistakes

  • Using 調子ちょうしに乗のる for innocent excitement. Calling excited kids 調子ちょうしに乗のっている sounds like a scolding — はしゃぐ is the neutral, positive word for that energy; 調子ちょうしに乗のる implies they've overstepped.
  • Using 羽目はめを外はずす for everyday enthusiasm. 羽目はめを外はずす specifically implies dropping a restraint that was there — using it for someone who's just naturally cheerful at all times doesn't fit; there's no "restraint" being removed.
  • Treating 無礼講ぶれいこう as a synonym for 羽目はめを外はずす. 無礼講ぶれいこう is the occasion or announcement; 羽目はめを外はずす is the action people take because of that occasion — they're cause and effect, not the same word.
  • Assuming のりのり always implies alcohol or a party. It doesn't — のりのり works for anything from a study group to a sports match; it's about enthusiasm, not permission to misbehave.

Which word should you use?

Word Reading What it describes Judgment
羽目はめを外はずす はめをはずす Letting loose, dropping restraint Mild, usually fond
調子ちょうしに乗のる ちょうしにのる Getting carried away, cocky Mildly critical
はしゃぐ はしゃぐ Boisterous, excited Usually none (はしゃぎすぎ is mild criticism)
無礼講ぶれいこう ぶれいこう A no-formalities occasion None (an event)
のりのり のりのり Enthusiastically into something None (positive)

FAQ

Is 羽目はめを外はずす always about drinking? Not exclusively, but it's the most common context — festivals, trips, and celebrations can trigger it too, as long as there's some normal restraint being temporarily set aside.

Is 調子ちょうしに乗のる always a criticism, or can it be lighthearted? It leans critical but can be said affectionately among close friends — 調子ちょうしに乗のるなよ said with a laugh is more teasing than a real rebuke, though the underlying meaning ("you're getting a bit ahead of yourself") stays the same.

Can you say 羽目はめを外はずしすぎた to mean you regret it? Yes — adding すぎた ("too much") signals that it went too far, and 後悔こうかいしている makes the regret explicit: 昨日きのうは羽目はめを外はずしすぎて後悔こうかいしている ("I let loose too much yesterday and regret it").

Does はしゃぐ apply to adults, or only kids? Both — it's associated with kids because that energy is stereotypically childlike, but adults having genuine, excited fun (at a festival, a reunion) are described with はしゃぐ too.

What would you say about someone who got too confident after a small win at work? 小ちいさな成功せいこうで調子ちょうしに乗のっている ("he's gotten carried away over a small success") is exactly the right register — mildly critical, about overconfidence rather than misbehavior.

Is there a word for the opposite — staying reserved even when everyone else is letting loose? There's no single fixed idiom, but 羽目はめを外はずさない ("not letting loose," simply negating the phrase) or 冷静れいせいを保たもつ ("to stay calm/composed") both work depending on what you want to emphasize.

Practice

1. "I let loose a bit at the drinking party." (mild admission)

Show answer

飲み会のみかいで少すこし羽目はめを外はずしてしまった。 — 羽目はめを外はずす implies dropping a normal restraint, here tied to drinking.

2. "Don't get cocky just because you won once."

Show answer

一回いっかい勝かっただけで調子ちょうしに乗のるな。 — 調子ちょうしに乗のる warns against overconfidence, not misbehavior at a party.

3. "The kids are having a blast at the amusement park." (no judgment)

Show answer

子供こどもたちが遊園地ゆうえんちではしゃいでいる。 — はしゃぐ carries pure excitement with no line being crossed.

4. "The president said, 'Tonight, forget the formalities.'"

Show answer

社長しゃちょうが「今日きょうは無礼講ぶれいこうだ」と言いった。 — 無礼講ぶれいこう is the named occasion that grants permission to let loose.

5. "Everyone was totally into it at karaoke."

Show answer

カラオケでみんなのりのりだった。 — のりのり is enthusiasm for the activity itself, not about crossing a line.

6. Fix this: 子供こどもたちが遊園地ゆうえんちで調子ちょうしに乗のっている。 (should sound like innocent excitement, not a scolding)

Show answer

子供こどもたちが遊園地ゆうえんちではしゃいでいる。 — 調子ちょうしに乗のる sounds like a criticism here; はしゃぐ is the neutral, positive word for kids' excitement.

7. "On festival nights, everyone lets loose a little."

Show answer

お祭まつりの夜よるは、みんな少すこし羽目はめを外はずす。 — festivals are one of the socially-sanctioned occasions for 羽目はめを外はずす.

8. "I let loose too much yesterday and regret it." (with regret)

Show answer

昨日きのうは羽目はめを外はずしすぎて後悔こうかいしている。 — 〜すぎる added to 羽目はめを外はずす explicitly signals it went too far.

During a trial lesson, describe a night out that got a bit wild, and decide whether it was a case of 羽目はめを外はずす or of somebody 調子ちょうしに乗のる.

Vocabulary from this article

Tap the block to select all of it, then copy. In Anki: File → Import, note type Basic, separator Tab — the first column becomes the front, the second the back.

羽目を外す	はめをはずす — to let loose, go overboard
調子に乗る	ちょうしにのる — to get carried away, get cocky
はしゃぐ	はしゃぐ — to be boisterous, excited
無礼講	ぶれいこう — a no-formalities occasion (drinking party)
のりのり	のりのり — fully, enthusiastically into something
飲み会	のみかい — a drinking party
後悔する	こうかいする — to regret
冷静	れいせい — calm, composed
褒める	ほめる — to praise
花火	はなび — fireworks

I'm Yuuki, a Japanese teacher based in Tokyo. I've taught on italki as a Top 1% teacher and watched over 1,500 anime, and 羽目はめを外はずす versus 調子ちょうしに乗のる is a distinction my students often miss — one describes harmless fun, the other quietly criticizes someone for overstepping.

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Sources: the author's own lessons and standard reference grammars.

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