Idiom: blue-collar worker
A blue-collar worker is someone who does manual work: work that usually requires them to wear work clothes or protective clothing such as overalls.
Example of use:
According to the Guardian newspaper, skilled and unskilled blue-collar workers have been hit much harder by the recession than white-collar workers.
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[...] also, blue-collar workers Example of use: According to China Daily, a new report on the health of Chinese white collar [...]