keep (someone or something) in check
To limit or restrain someone or something. We need to come up with provisions to keep the new director in check—otherwise, he'll totally dismantle our department.
keep someone or something in check
and hold someone or something in checkto keep someone or something under control; to restrain someone or something. Hang on to this rope to keep the dog in check. I was so angry I could hardly hold myself in check.