Overview of noun offside

The noun offside has 1 sense

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

Overview of adj offsides

The adj offsides has 1 sense

• 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")