adjective. illegally beyond a prescribed line or area or ahead of the ball or puck.
noun. (sport) the mistake of occupying an illegal position on the playing field (in football, soccer, ice hockey, field hockey, etc.).
Example sentences of the word offside
An offensive player can only be called for a neutral zone penalty if he lines up offside.
2. Noun, singular or mass
In a dead ball situation such as a foul or an offside, use a goal kick to drive a ball that is on the ground downfield.