A person whose job is to caulk seams and gaps, especially in ships, to make them waterproof.
From 'caulk' plus the agent suffix '-er,' denoting one who performs the action. Developed as a trade term in maritime communities where specialized workers maintained vessel integrity.
Caulkers in the Age of Sail were like the ship doctors of their time—their skill determined whether a vessel would float or sink, and they were paid handsomely because ships literally couldn't leave port without them!
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