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1. To shoot and kill someone. A noun or pronoun can be used between "gun" and "down." You just gunned down an innocent man, and you're going to pay! We need to make a change before one more innocent person gets gunned down.
2. To shoot something with bullets so that it falls to the ground. A noun or pronoun can be used between "gun" and "down." Security forces gunned down a helicopter attempting to attack the airport.
gun someone (or an animal) down
Lit. to shoot someone or an animal. Max tried to gun a policeman down. The cop tried to gun down the rabid dog.
1. To cause something to collapse or fall by striking it with bullets, missiles, or some other projectile; shoot down something: The marines gunned down the attacking airplanes. The soldiers gunned the enemy down.
2. To kill or incapacitate someone by shooting: They stormed into the hideout and gunned down all the soldiers there. The assassin tracked down the politicians and gunned them down.