I wouldn’t put it past somebody (to do something)

idiomPart ofput

I wouldn’t put it past somebody (to do something) — idiom

1. You use this to say that you believe someone is able to do something bad or dish

1.idiom
Definition

You use this to say that you believe someone is able to do something bad or dishonest.

Example

I wouldn't put it past Brian to cheat on the test.

Would you put it past Maya to lie about her age?