Burn the candle at both ends:
燃烧了蜡烛 ×
非常忙碌，过度疲劳 √
例句：
I can't burn the candle at both ends forever.
我不能永远这么过分的消耗精力。
Bite the hand that feeds you:
咬掉喂养你的手 ×
忘恩负义 √
例句：
As the old saying goes Never bite the hand that feeds you.
古话说：千万不要恩将仇报。
Eat some shit:
一起去吃屎 ×
一起去吃点东西 √
例句：
Let's go eat some shit.
一起去吃点东西。
