A person who prepares, sells, or deals in billies (containers) or billycock hats.
English agent noun formed from 'billy' or 'billycock' with the suffix '-er' to indicate a person who works with these items or trades in them.
Though rarely used today, 'billyer' shows how English creates professional titles—imagine being a billyer in Victorian London, a specialist in just one type of fashionable hat!
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