like a thief in the night

US /laɪk ə θiːf ɪn ðə naɪt/
UK /laɪk ə θiːf ɪn ðə naɪt/
"like a thief in the night" picture
1.

밤도둑처럼, 예고 없이

unexpectedly and without warning, often with negative connotations of stealth or sudden departure

:
He left like a thief in the night, owing everyone money.
그는 모두에게 돈을 빚진 채 밤도둑처럼 떠났다.
The storm arrived like a thief in the night, catching everyone off guard.
폭풍은 밤도둑처럼 닥쳐 모두를 놀라게 했다.