keep (a) close watch on (someone or something)

keep (a) close watch on (someone or something)

To monitor someone or something closely. Keep a close watch on this pot so that the soup doesn't boil over.
See also: close, keep, on, watch

keep a close watch on someone or something

to watch someone or something very carefully. Let's keep a close watch on Fred and his friends. I want to keep a close watch on the house across the street.
See also: close, keep, on, watch