also fire-bomb, 1895 (earlier as a type of fireworks and a type of cannonball), from fire (n.) + bomb (n.). As a verb, from 1950 as an act of vandalism or terrorism, from 1941 as a military aviation tactic. Related: Firebombed; firebombing.
1. Over the weekend, a firebomb gutted a building where 60 people lived.
2. Five shops were damaged in a firebomb blitz.
3. To launch an attack against a target, using a firebomb.