(transitive) To kill by means of a firearm, especially deliberately and in a brutal manner. When Manzanas arrived home from work, the assailant gunned him down from ambush with a volley of pistol shots and escaped across the nearby border to France.

To kill by means of a firearm, especially deliberately and in a brutal manner. To gun down refers to the act of shooting someone with a firearm, intending to injure or kill. It involves sudden, intense, and violent action and is typically associated with crimes or events of warfare.