in twos and threes
成語所屬單字three
in twos and threes — 慣用語
1. Happening with small groups of two or three people at a time.
1.慣用語
釋義
三三兩兩地
Happening with small groups of two or three people at a time.
例句
The guests arrived in twos and threes throughout the evening.
Did you see the students leaving in twos and threes after class?