실수하면 안 돼

must not make a mistake

→ 실수하다

phrase Rare #19,935

must not make a mistake A colloquial expression meaning that making a mistake is not allowed or must be avoided. The pattern -으면 안 되다 means “must not” or “should not.”

KO: 이번에는 정말 실수하면 안 돼.

EN: I really must not make a mistake this time.

놈은 고수 니까 실수하면 안 돼

He's a pro, so he can't afford to make mistakes.

— 포풍추영 (2025)

실수하면 안 돼

Don't make a mistake.

— 굿바이, 레닌 (2003)

오늘 밤은 정말 실수하면 안 돼

I really can't afford to make a mistake tonight.

— 인생은 아름다워 (1997)