Blue collar

Blue Collar
Blue collar describes an individual or class of individuals who are employed in manual labor trades and earn hourly wages.
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The "blue collar" aspect of a "blue collar worker" may be a misnomer these days, since skilled laborers and union workers are not necessarily limited to blue work shirts anymore.

Is a police officer a blue collar worker or a white collar worker?
What are some white collar workers?
Trace in which white collar worker?
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This class of worker stands in contrast to blue collar workers, who traditionally wore blue shirts and worked in plants, mills and factories.

Human effort expended in return for pay or wages. Generally, labor refers to factory production as opposed to office work. Also the general classification of BLUE COLLAR workers.
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White collar workers historically have been the "shirt and tie" set, defined by office jobs and not "getting their hands dirty" (or their white collar dress shirts).
This class of worker stands in contrast to blue collar workers, ...

See also: Collar, Fraud, Job, Window dressing, Bargain