wouldn't put it past one
wouldn't put it past one {v. phr.}
To think that someone is quite capable or likely to have done something undesirable or illegal.
Congressman Alfonso is insisting that he didn't violate congressional ethics, but knowing both his expensive habits and his amorous escapades, many of us wouldn't put it past him that he might have helped himself to funds illegally.
Categories:
Source: A Dictionary of American Idioms
