To go out onto the playing field. / To begin military operations. / (horse racing) To stake one's money against the favourite, taking the chances of the field against the chance of one horse.

(military, chiefly US) An airfield outside of the homebase.

An area of academic concentration; a discipline.

(baseball) The part of a baseball field which is beyond the infield and straight ahead left if you stand on home plate and face the pitcher.

(baseball) The part of a baseball field which is beyond the infield and to your right if you stand on home plate and face the pitcher.

(UK, horseracing) To cut one's losses by betting on every racehorse other than the crowd favorite. / To have numerous romantic partners, without or before committing exclusively to one.

A battlefield; any place where a duel is fought.

(military) In certain nations the highest military rank, ranking below only the commander in chief; now essentially disused.

plural of field marshal

(transitive) To dismantle (a weapon) for cleaning, oiling or repair; to disassemble (a firearm) to the maximum extent possible without tools.