offside Meaning, Definition & Usage

1. noun (sport) the mistake of occupying an illegal position on the playing field (in football, soccer, ice hockey, field hockey, etc.)
   
2. adjective illegally beyond a prescribed line or area or ahead of the ball or puck
   offsides.
   
   • the touchdown was nullified because the left tackle was offside
3. adverb illegally in advance of the ball or puck
   

WordNet