Longman Dictionary of Contemporary English - horse

~1 n 1 a large strong animal that people ride on and use for pulling heavy things 2 the horses informal horse races 3 straight from the horse's mouth if you hear something straight from the horse's mouth, you are told it by someone who has direct knowledge of it 4 a piece of sports equipment in a gymnasium used for jumping over; vaulting horse 5 horse sense old-fashioned sensible judgement gained from experience; common sense 6 the process of trying to reach an agreement by offering each other things in exchange for other things 7 old-fashioned slang heroin  (- see also dark horse dark1 (9), never/don't look a gift horse in the mouth gift (6), be flogging a dead horse flog (3), hold your horses hold1 (29), put the cart before the horse cart1 (4), stalking horse, white horses) ~2 v horse around/about phr v informal to play roughly  (Stop horsing around, you'll break something!)