たちまち (tachimachi) Japanese meaning: in an instant | Kotomora質
問
を
聞
く
と
たちまち
答
え
た
。
He answered the question immediately after hearing it.
As soon as it started raining, the street was instantly flooded.
Usage patterns
たちまち〈物〉が売り切れるfor something to sell out in an instant
This bread sold out in no time.
たちまち〈事〉が広がるfor news or a rumor to spread quickly
The news spread through the whole town in an instant.
たちまち〈事〉になるto suddenly turn into (a state or situation)
He suddenly became a celebrity.