A brand name that became a common term for a leather strap or strop used for sharpening and stropping straight razors and knives.
From 'Bronstrop,' a trade name for a British product. The Bronstrop razor strop became so popular and well-known that it turned into a generic term, similar to how 'kleenex' is used for tissues.
Bronstrop leather strops were so good at sharpening razors that the brand name stuck around even after other companies made similar products. This happens a lot in English—'Band-Aid,' 'Kleenex,' and 'Xerox' all started as brand names but became common words.
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