blue-collar adjective 2noun 1forms 3 adjective2 •Working class; engaged or trained in essentially manual labor.Blue-collar workers represent a diminishing segment of society. •Pertaining to the culture of blue-collar workers.Even as a tenured professor, she remained proud of her blue-collar values. noun1 •A blue-collar worker. formsblue-collars · more blue-collar · most blue-collar