like a thief in the night
US /laɪk ə θiːf ɪn ðə naɪt/
UK /laɪk ə θiːf ɪn ðə naɪt/

1.
像夜贼一样, 出其不意地
unexpectedly and without warning, often with negative connotations of stealth or sudden departure
:
•
He left like a thief in the night, owing everyone money.
他像夜贼一样离开了,欠了所有人的钱。
•
The storm arrived like a thief in the night, catching everyone off guard.
暴风雨像夜贼一样突然来袭,让所有人措手不及。