Merriam-Webster Collegiate Dictionary - blue-collar

 adjective  Date: 1946  1. of, relating to, or constituting the class of wage earners whose duties call for the wearing of work clothes or protective clothing — compare white-collar  2. having characteristics associated with ~ workers: as  a. having, showing, or appealing to unpretentious or unsophisticated tastes a new ~ serial…woven around a minor-league baseball team — Steven Flax  b. dependable and hard-working rather than showy or spectacular a ~ athlete