"offsides" in the noun sense
1. offside
sport) the mistake of occupying an illegal position on the playing field (in football, soccer, ice hockey, field hockey, etc.)
"offsides" in the adjective sense
1. offside, offsides
illegally beyond a prescribed line or area or ahead of the ball or puck
"the touchdown was nullified because the left tackle was offside"
Source: WordNet® (An amazing lexical database of English)
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