(uncountable) A (usually self-sustaining) chemical reaction involving the bonding of oxygen with carbon or other fuel, with the production of heat and the presence of flame or smouldering.

(transitive) To set (something, often a building) on fire. / (transitive) To heat as with fire, but without setting on fire, as ceramic, metal objects, etc.

(slang) Amazing; excellent.

Being burned by fire. / (idiomatic) Achieving good results at a rapid rate. / (idiomatic) Sexually aroused.

dismissed, let go from a job. / (ceramics) Heated in a furnace, kiln, etc., to become permanently hardened.

simple past tense and past participle of fire

(military) Fire when ready. A command that allows troops to use weapons at their discretion and choose their own targets, allowing the individual soldier a greater freedom of timing the shot with target movement and similar.

(finance) Acronym of financial independence and early retirement. / (economics, business) Acronym of finance, insurance and real estate: a class of businesses.

(idiomatic) To respond to an attack with a similar or identical counter-attack (e.g. to respond to gunfire with reciprocal gunfire).

present participle of fight fire with fire