mount guard(redirected from mounting guard)
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To watch over someone or something; to act as a guard or a lookout for someone or something. He mounted guard outside the bathroom to make sure no one walked in on Jeremy getting sick. The police are mounting guard around the prison, lest the prisoner should attempt escape a second time.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, 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