Idiom 160: off one's rocker

미쳐서, 열광해서, 흥분해서란 뜻을 가진 표현입니다.

off one's rocker = crazy

He is off his rocker if he thinks I'm going to help him decorate for the party.

Idiom 159: have someone's number

어떤 사람의 속셈을 간파하다라고 할 때 쓰는 표현입니다.

have (or get) someone's number = know what kind of person someone is

He doesn't think anyone knows, but I know he stole the material for the book. I've got his number.