mount/stand/keep guard

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stand guard

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.
See also: guard, stand

mount/stand/keep ˈguard (over somebody/something)

act as a guard: Two soldiers stood guard over the captured weapons.
See also: guard, keep, mount, stand

stand guard

1. To keep watch.
2. To act as a sentinel.
See also: guard, stand