It is the middle of summer, and boy is it hot.
Our idiom is rub off.
The first meaning is to remove something off a surface by rubbing it.
Don't worry about putting lipstick on the mirror. It will rub off with a wet cloth.
The second meaning is to have someone's behavior or characteristics adopted by another person.
I sure hope my husbands seriousness rubs off on our son soon. He doesn't take anything serious.
My daughter has been hanging around some bad kids lately and their bad attitudes are rubbing off on her. I don't like it at all.