How to Say "Uh Oh" in Japanese

あっ

The English phrase "uh oh" can be translated into Japanese as あっ (a').

あっ is used as a sudden exclamation when one realizes a mistake or a sudden change in situation, similar to 'oh!' or 'uh oh' in English.

How do you pronounce it?

The sound あっ is one of the few expressions in Japanese that is used almost identically across all regional dialects from Hokkaido to Okinawa.
In Japanese manga, the exclamation あっ is often accompanied by a specific visual symbol, such as a small vertical line or a sweat drop, to indicate the character's sudden realization.
While あっ is a quick realization, adding a long vowel sound like あー can change the tone from a sharp 'oops' to a more drawn-out sense of disappointment or regret.

「あ、田中さん！」「あっ……！」「元気だった？」「うん。えっと、あっ……！名前ど忘れしちゃった。ごめんなさい。名前なんて言うんだったけ？」「もぉ、国貞よ。国貞恵子」「そうそう、国貞さん。お久しぶり！」
"Oh, Tanaka-san!" "Uh…!" "Have you been doing well?" "Yeah. Um, uh…! Oh my god, I'm so sorry, but your name is slipping my mind. What's your name again?" "Really? Come on. I'm Kunisada. Keiko Kunisada." "Oh, right, Kunisada-san. It's been a while!"
This sentence shows how to use あっ when you suddenly realize you have forgotten someone's name.
Tatoeba #10349079 by small_snow, translation #10794318 by end
「大変なことになりました！」(Taihen na koto ni narimashita!)
We have a problem!
「あっ、問題が発生した！」(A, mondai ga hassei shita!)
Uh oh, we have a problem!
あっ、スマホを忘れた。
A, sumaho o wasureta.
Uh oh, I forgot my smartphone.

Misaki and Ren are looking at a cake they baked.

美咲 Misaki

見て、蓮！ケーキが完成したよ。
Mite, Ren! Kēki ga kansei shita yo.
Look, Ren! The cake is finished.
蓮 Ren

本当だ。あ、でもちょっと焦げてる。
Hontō da. A, demo chotto kogeteru.
You're right. Oh, but it's a bit burnt.
美咲 Misaki

あっ！本当だ。どうしよう！
A'! Hontō da. Dō shiyō!
Uh oh! You're right. What should I do!
蓮 Ren

大丈夫だよ。味は変わらないと思う。
Daijōbu dayo. Aji wa kawaranai to omou.
It's okay. I don't think the taste will change.

Sources

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