Burn the candle at both ends:

燃燒了蠟燭 ×

非常忙碌，過度疲勞 √

例句：

I can't burn the candle at both ends forever.

我不能永遠(yuǎn)這么過分的消耗精力。

Bite the hand that feeds you:

咬掉喂養(yǎng)你的手 ×

忘恩負(fù)義 √

例句：

As the old saying goes Never bite the hand that feeds you.

古話說：千萬不要恩將仇報(bào)。

Eat some shit:

一起去吃屎 ×

一起去吃點(diǎn)東西 √

例句：

Let's go eat some shit.

一起去吃點(diǎn)東西。