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To watch over someone or something; to act as a guard or a lookout for someone or something. He stood guard outside the bathroom to make sure no one walked in on Jeremy getting sick. The police are standing guard around the prison, lest the prisoner should attempt escape a second time.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Watch over, act as a lookout, as in We'll climb the tree and get the apples if Josh will stand guard, or There's a parking space; stand guard while I make a U-turn and get to it. This term alludes to the military defense of posting guards to watch for the enemy.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
mount/stand/keep ˈguard (over somebody/something)act as a guard: Two soldiers stood guard over the captured weapons.
Farlex Partner Idioms Dictionary © Farlex 2017
1. To keep watch.
2. To act as a sentinel.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.