あ あ interjection ah, oh informalexpression 1. ah, oh (realization) Exclamation expressing sudden realization, recognition, or remembering something. あ、忘(わす)れてた！🔊 Oh, I forgot! Sudden realization あ、田中(たなか)さん！🔊 Oh, Mr. Tanaka! Recognizing someone あ、そうだ。🔊 Oh, that's right. Remembering something あ、いいですよ。🔊 Oh, that's fine. あ、ごめんなさい。🔊 Oh, I'm sorry. あ、傘(かさ)を忘(わす)れた。取(と)りに戻(もど)らなきゃ。🔊 Oh, I forgot my umbrella. I have to go back and get it. あ、鍵(かぎ)をかけ忘(わす)れていたことに今(いま)気(き)づいた。🔊 Oh, I just realized I forgot to lock the door. 2. ah, oh (surprise) Exclamation expressing mild surprise or noticing something. あ、電車(でんしゃ)が来(き)た。🔊 Oh, the train is coming. あ、雨(あめ)が降(ふ)ってきた。🔊 Oh, it's started raining. あ、虹(にじ)が出(で)てる！🔊 Oh, there's a rainbow! あ、猫(ねこ)がいる！🔊 Oh, there's a cat! あ、外(そと)に雪(ゆき)が降(ふ)っている。見(み)に行(い)こう。🔊 Oh, it's snowing outside. Let's go see. あ is a very common interjection with various uses depending on intonation and context.Common expressionsあ、そうですか: Oh, is that so?あ、いいですよ: Oh, that's fineあ、ごめんなさい: Oh, sorryあ、そうだ: Oh, that's right (remembering)Related interjectionsああ: longer form, can express agreement or disappointmentあっ: sharper, more surprisedあれ: expressing confusion or surprise basic Added 2026.1.9 21:27 · Revised 2026.9.2 13:01 01500/01572_a