"visitor," mid-14c., from agent noun of come. Meaning "one showing promise" is attested from 1879. Phrase all comers "everyone who chooses to come" is recorded from 1560s.
n. someone with a bright future. : Fred is a real comer. You'll be hearing a lot about him.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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