A person or device that removes hair by cutting it very close to the skin, or informally, a young boy.
From Middle English 'shaven' (to shave), which comes from Old English 'sceafan.' The informal meaning 'a young person' developed in the 1800s from a child's smooth face.
Calling someone 'a young shaver' is old slang that pops up in 1920s-1950s literature because kids' smooth faces were compared to freshly shaved skin—it's like calling someone 'a smooth operator' but for babies!
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