Antonyms of adj onside

1 sense of onside

Sense 1
onside (vs. offside) -- (not offside; being within the prescribed area of play)

offside (vs. onside), 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")

Similarity of adj onside

1 sense of onside

Sense 1
onside (vs. offside) -- (not offside; being within the prescribed area of play)