/awf"suyd", of"-/ , adj. , adv.
1. Sports. illegally beyond a prescribed line or area or in advance of the ball or puck at the beginning of or during play or a play: The touchdown was nullified because the offensive left tackle was offside.
2. with or in doubtful propriety or taste; risqué: an offside joke.
[ 1840-50; OFF + SIDE 1 ]