Wiktionary
fired off
vb. (en-pastfire off)
Usage examples of "fired off".
There had been no rocket volleys for some time, but now another six were fired off.
He fired off the antique weapon's entire drum of ammunition, checking them till I managed to drag the big modern gun from the wall around and join in.
I probably fired off a few hundred bullets at random, having no idea what I'd hit or if I hit anything at all.
John fired off four more rounds, dropping the last Lizzar as he began his charge all alone.
When the first Lizard plane screamed overhead, he fired off a long burst.
He fired off his pistols down into the caldron, spacin out the shots, and he fired all ten chambers and cautioned us back from sight while he reloaded the pieces.