offside
— Noun
– English
～ (sport) the mistake of occupying an illegal position on the playing field (in football, soccer, ice hockey, field hockey, etc.)
offside
— Adjective
– English
～ illegally beyond a prescribed line or area or ahead of the ball or puck; "the touchdown was nullified because the left tackle was offside"
offside
— Adverb
– English
～ illegally in advance of the ball or puck