Wiktionary
opens fire
vb. (en-third-person singularopen fire)
Usage examples of "opens fire".
Bischoffs crew opens fire on the destroyers with all of the small and medium-sized stuff, to give the deck gun crew a chance to line up its shot.
Drenn immediately opens fire - not on the heroes, but on the sacred ruins.
Then, even as it begins to realize that Seth isn't really inside the body it has been trying to re-enter, the woman in the doorway opens fire.
Then, Christ, Sharkle opens fire on 'em because he's wearin' a gas mask same as they are and just waitin' like a cat.
It is important that when the Army opens fire on something everybody does it together.