n (US) An informal variant of basketball in which players match shots made by their opponent(s), each miss adding a letter to the word "horse", with 5 misses spelling the whole word and eliminating a player, until only the winner is left. Also HORSE, H-O-R-S-E or H.O.R.S.E. (See (pedialite|Variations of basketball#H-O-R-S-E))
v (intransitive) To frolic, to act mischieviously. (Usually followed by "around".)