keep a close watch on
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. I've asked the manager to keep close watch on Tom. I'm pretty sure he's been stealing from the register.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
keep a close ˈeye/ˈwatch on somebody/somethingwatch somebody/something carefully: Over the next few months we will keep a close eye on sales.
Farlex Partner Idioms Dictionary © Farlex 2017