From Longman Dictionary of Contemporary Englishoffsideoff‧side1 /ˌɒfˈsaɪd◂ $ ˌɒːf-/ adjective, adverb DSin a position, usually ahead of the ball, where you are not allowed to play the ball in sports such as soccer and hockey OPP onsideoffsideoff‧side2 /ˈɒfsaɪd $ ˈɒːf-/ noun → the offside —offside adjective the offside headlight
Examples from the Corpus
offside• The next and last ball was also of yorker range, this time Klusener digging it out to the offside of straight. 