(American football) The act by a player in the backfield of dropping back from the line of scrimmage after the hike of the ball.

(phonetics) Any vowel sound produced in the back of the mouth, such as /uː/ in rule or /əʊ/ in pole.

(soccer) A central defender, a player who plays in the centre of defence, just in front of the goalkeeper

(soccer) A player who plays on the wing, and acts as both a defender and an attacker depending on the team's situation.

To make hair flat by putting oil, water, etc. on it.

(sports, billiards, snooker, pool) To cue the cue ball in such a way as to impart backspin. On impact, the ball will follow a reverse trajectory according to the spin.

plural of back yard

(transitive) To return, restore (a thing to its original owner or location etc.).

plural of back fire

Used other than figuratively or idiomatically: see look, back. / (intransitive) To reconsider or regret.