off·side 
/ˈɑ:fˈsaɪd/ adjective
/ˈɑ:fˈsaɪd/ adjective 1 sports : in a position in a game (such as football or hockey) on the opponent's part of the field where you are not allowed to be : not onside
▪ The play was stopped because the center was offside. 2 Brit : on the right side : right-hand
▪ the car's offside mirror/headlight — compare nearside
▪ The play was stopped because the center was offside.
▪ the car's offside mirror/headlight — compare nearside
the offside
Brit : the right-hand side
▪ The car was damaged on the offside.
▪ The car was damaged on the offside.
— offside adverb
