What is "offsides"

offside \offside\ offsides \offsides\adj. (Sports) Illegally beyond a prescribed line or area or ahead of the ball or puck; -- in sports such as football or hockey; as, the touchdown was nullified because the left tackle was offside.

n. (plural of offside English)

adj. illegally beyond a prescribed line or area or ahead of the ball or puck; "the touchdown was nullified because the left tackle was offside" [syn: offside] [ant: onside]