knock dead

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释义
（鼓励某人的话）加把劲；干他们
To strongly impress one. Often used as an imperative to give encouragement.

例句
Doug:Stay in touch.You call me on my cell, never at the office.Good luck.Knock 'em dead, tiger.
保持联系，有事打我手机，千万别打到办公室，祝你好运，别手下留情。（纸牌屋）