【俚语】

Bite one's lip
忍住没说；抑制情感流露

【例句】

I really wanted to laugh - But I had to bite my lip.
我真的想笑——但只能忍住。

Bite off more than you can chew
承担力所不及的事，吃多嚼不烂

【例句】

He has promised to get all this work finished by the weekend. And I think he’s biting off more than he can chew.
他承诺在周末前完成所有工作。我感觉他这是吃多嚼不烂。

sb/sth won't bite 不用害怕

【例句】

This is your Uncle Jack, son. Go and shake his hand, he won't bite.
这是你的杰克叔叔，儿子。去和他握手，不用害怕。

Have/grab a bite 随便吃一些

【例句】

Let's have a bite before we get on the road.
我们上路前先随便吃点东西吧。

Bite one's head off
向某人怒吼/发火

【例句】

What's wrong with the boss today? I just tried to ask him a question, and he totally bit my head off!
老板今天怎么了？我只是想问他一个问题，但他是那么生气！