third string adjective 3noun 1forms 1 adjective3 •belonging to the third string of a team; one who plays behind the first and second strings.The young college quarterback was on the third-string, and played only during blowouts. •a substitute or replacement. •Of a decidedly lower quality or condition. noun1 •A unit of players that plays behind the first and second strings; a junior varsity team. formsthird strings
