Definition of 'offside'

Noun

1. (sport) the mistake of occupying an illegal position on the playing field (in football, soccer, ice hockey, field hockey, etc.)

Adjective

1. illegally beyond a prescribed line or area or ahead of the ball or puck; "the touchdown was nullified because the left tackle was offside"
      Synonyms: offsides
      Antonyms: onside

Adverb

1. illegally in advance of the ball or puck

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