not lift a finger 袖手旁观；不帮忙

【例句】
We all worked hard except Joe. He would not lift a finger.
除了乔之外，我们大家都很卖力气，他却袖手旁观。

His wife decided to spring-clean this apartment ,but he did not lift a finger to do the housework.
他的妻子决定给房子做个大扫除，但他什么家务都不帮忙。