あっ

あっ
interjection
ah!; oh!; oops!
1. ah!; oh!; oops!
A short, sharp exclamation of sudden surprise, alarm, or realization—often the first reaction before saying more.
あっ、(あぶ)ない!
Ah, watch out!
あっ、(わす)(もの)をした。
Oh, I forgot something.
あっ、そういえば約束(やくそく)があったのを(おも)()した。
Oh, that reminds me—I just remembered I had plans.

A short, sharp exclamation marking a sudden reaction—surprise, alarm, or the moment of noticing or remembering something. The small っ gives it an abrupt, clipped sound.

TYPICAL USES:

  • Noticing something suddenly: あっ、(あめ)だ (Oh, it's raining)
  • Warning or alarm: あっ、(あぶ)ない (Look out!)
  • Sudden recollection: あっ、そうだ (Oh, that's right)

SIMILAR WORDS:

  • ああ: ah — longer; can express understanding, admiration, or dismay
  • あれ: huh? — expresses puzzlement that something is unexpected