( informal ) used to say that you think sb is capable of doing sth wrong, illegal, etc.
I WOULDN'T PUT IT PAST SB (TO DO STH)
Meaning of I WOULDN'T PUT IT PAST SB (TO DO STH) in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005