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Phrase(s): blue collar
of the lower class or working class; of a job or a worker, having to do with manual labor. (Also, when used as an attributive adjective, often blue-collar. Compare this with white collar. Alludes to the typical color of work shirts worn by mechanics, laborers, etc.) • His parents were both blue-collar workers. He was the first person in his family to go to college. • They bought a house in a nice, settled, blue-collar neighborhood.
McGrawhill's American Idioms And Phrasal Verbs