Take a back seat:
坐后排 ×
屈居人下，甘拜下风 √
例句：
He said he wouldn't take a back seat to anybody, but the President.
他说除了总统本人之外，他对谁都不买账。
Beef it:
吃牛肉 ×
狼吞虎咽 √
例句：
I found a box of cookies and beefed it before anybody knew what I was doing.
我找到一盒小甜饼，在别人还未察觉时，就狼吞虎咽地把它吃了。
In a black mood:
黑色的心情 ×
心情很糟糕 √
例句：
I'm in a black mood.
我心情很糟糕。
（素材来自网络，如有侵权请联系删除）
