一瞬で

いっしゅんで
expression
in an instant; in a flash; instantly
1. in an instant; in a flash; instantly
Describes something happening in an extremely short moment. Formed from 一瞬(いっしゅん) (a moment) plus the particle で marking the span of time over which something occurs.
一瞬(いっしゅん)で消(き)えた。
It vanished in an instant.
火(ひ)は一瞬(いっしゅん)で広(ひろ)がった。
The fire spread in a flash.
彼(かれ)の一言(ひとこと)で、場(ば)の空気(くうき)が一瞬(いっしゅん)で変(か)わった。
With one word from him, the mood of the room changed in an instant.

Adverbial phrase built from the noun 一瞬(いっしゅん) (a moment, a split second) plus で.

COMMON COLLOCATIONS:

  • 一瞬(いっしゅん)で終(お)わる: to be over in an instant
  • 一瞬(いっしゅん)で消(き)える: to disappear instantly
  • 一瞬(いっしゅん)で判断(はんだん)する: to decide in a split second

SIMILAR WORDS:

  • あっという間(ま)に: in the blink of an eye — emphasizes that time passed faster than expected
  • 瞬時(しゅんじ)に: instantaneously — more formal and technical
general
Added 2026.5.24 13:10
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