A person who frequently drinks drams of strong alcohol, or someone who works in a dram-shop.
From dram + -er suffix (one who does), marking someone who drinks drams or serves them professionally in a dram-shop.
A 'drammer' wasn't just a drinker but someone for whom dram-drinking was their social identity—it's like how 'commuter,' 'gamer,' or 'runner' describe someone defined by a repeated action. The -er suffix is incredibly efficient at creating identity words.
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