便びん乗じょう主しゅ義ぎ者しゃMeaningsNoun1. opportunistKanji used便convenience乗ride主(one's) master義justice者someoneComposed of便びん乗じょうtaking advantage of (an opportunity); jumping on the bandwagon; taking passage (in); getting a lift; getting a rideNoun主しゅ義ぎ者しゃadvocate (of a theory or principle); ideologist; ideologue; -ist (i.e. adherent to a belief system)Noun