Initialism of best available technology: a principle applying to regulations on limiting pollutant discharges. / Initialism of brown adipose tissue.

(sports) Abbreviation of Bathurst.

(transitive) To hit with a bat or (figuratively) as if with a bat. / (intransitive) To take a turn at hitting a ball with a bat in sports like cricket, baseball and softball, as opposed to fielding.

(Caribbean, MLE) Clipping of batty (“buttocks or anus”).

A club made of wood or aluminium used for striking the ball in sports such as baseball, softball and cricket. / A turn at hitting the ball with a bat in a game.

Dated form of baht (“Thai currency”).

(obsolete) A packsaddle.

(UK, dialect, obsolete) A child's shoe without a welt. / (UK, slang, obsolete) A boot that is badly made or in poor condition.

Any of the flying mammals of the order Chiroptera, usually small and nocturnal, insectivorous or frugivorous. / (derogatory) An old woman.

(transitive) To flutter / (US, UK, dialect) To wink. / (intransitive, usually with 'around' or 'about') To flit quickly from place to place.