A blacksmith who works with a hammer, or a person skilled in making or repairing things with hammers.
From 'hammer' (the tool) + 'smith' (craftsperson). Historically, this was an actual trade occupation. Also the name of a district in London where such craftspeople worked.
Medieval hammersmith guilds had incredibly strict standards—an apprentice trained for seven years just to master the angles, speed, and force needed to forge metal properly, and their 'hammermarks' were signatures as unique as fingerprints.
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