old boyTranslate old boy | into Italian Definition of old boy noun 1British a former male student of a school or college: an old boy of Banbury County School a former male member of a sports team or company: the White Hart Lane old boy squared the ball to present an easy chance from 12 yards 2 informal an elderly man: he slipped a shilling into the old boy’s palm chiefly British an affectionate form of address to a boy or man: ‘Look here, old boy,’ he saidold boy in other Oxford dictionaries Definition of old boy in the US English dictionary