sit back
1．relax and do nothing休息
It's marvellous to be able to sit back after a day's hard work．一天辛劳工作后能坐下来休息休息真是太美妙了。
Get on with the work；this is not time to sit back．干活吧，这会儿可不是坐下来休息的时候。
2．be inactive；become a spectator 不采取行动；旁观
He's happy just to sit back and let others make the decision．他真乐意袖手旁观而让别人作决定。
Do you expect me to sit back and do nothing？你希望我袖手旁观什么也不干吗？