Bite one's lip
I really wanted to laugh - But I had to bite my lip.
Bite off more than you can chew
He has promised to get all this work finished by the weekend. And I think he’s biting off more than he can chew.
sb/sth won't bite 不用害怕
This is your Uncle Jack, son. Go and shake his hand, he won't bite.
Have/grab a bite 随便吃一些
Let's have a bite before we get on the road.
Bite one's head off
What's wrong with the boss today? I just tried to ask him a question, and he totally bit my head off!