give it the gun

Give it the gun.

 and Give her the gun.
Fig. to make a motor or engine run faster; to rev up an engine. (The her is often pronounced "er.") Bill: How fast will this thing go? Bob: I'll give it the gun and see. Hurry up, driver. Give 'er the gun. I've got to get there immediately.
See also: give, gun

give it the gun

tv. to gun an engine; to rev an engine up. I gave it the gun, and it backfired.
See also: give, gun