Pump bullets, shots, etc. into somebody
Definition 1 of 1
Pro Tip 1/3Violent Imagery
This phrase often indicates a violent action in crime or action genres. It's graphic and may be upsetting. 
In the movie, the hero pumped bullets into the gang, saving the hostages.
Pro Tip 2/3Emotional Intensity
The phrase implies strong emotions, like anger or desperation, from the shooter. 
Fueled by revenge, she pumped shots into the villain’s hideout.
Pro Tip 3/3Figurative Usage
Metaphorically, it can describe a focused and aggressive action, not always shooting. 
He pumped accusations into the argument, overwhelming his opponent.