WordNet
stand guard
v. watch over so as to protect; "We must stand sentinel to protect ourselves"; "The jewels over which they kept guard were stolen" [syn: stand watch, keep guard, stand sentinel]
Usage examples of "stand guard".
A Bolo could stand guard duty until his tread corroded away under him, and as long as he felt like he was performing a useful duty, he would be satisfied.
Once in place they would stand guard at the edge of the nothings and wait for whatever arrived.