1A narrow gap or opening between two things, such as a crack in a door, window, or wall.
ドアの隙間から冷たい風が入ってくる。
Cold air comes in through the gap under the door.
本棚の隙間に埃がたまっていた。
Dust had collected in the gaps of the bookshelf.
カーテンの隙間から光が漏れている。
Light is leaking through the gap in the curtains.
隙間風が入らないようにテープで塞いだ。
I sealed it with tape so a draft wouldn't come through the gap.
2(Dated) A brief spare moment or interval between tasks; an old-fashioned synonym of 隙 (すき), rarely used today.
忙しい仕事の隙間を見て、久しぶりに手紙を書いた。
Finding a spare moment amid my busy work, I wrote a letter for the first time in a while.
3(Dated) An opening created by carelessness or a lapse in vigilance that an opponent can exploit; an old-fashioned synonym of 隙, seldom used now.
敵は油断した隙間をついて攻めてきた。
The enemy attacked by exploiting the opening created by our carelessness.