squeeze off
To fire one or more rounds of ammunition from a firearm by squeezing its trigger. A noun or pronoun can be sued between "squeeze" and "off." The officer squeezed off a shot before the suspect had a chance to put his hands in the air. They squeezed a few rounds off into the air to scare the crowd of people away.
squeeze off
Fire a gun, as in He squeezed off one shot after another but didn't bring down a single crow. The idiom alludes to squeezing the trigger. [Mid-1900s]
squeeze off
v. To fire some amount of ammunition by squeezing a trigger: The police officer squeezed off four shots. I squeezed the shots off in rapid succession.