Etymology
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comer (n.)

late 14c., "visitor, one who approaches or is lately arrived," agent noun from come. Meaning "one showing promise" is attested from 1879. Phrase all comers "everyone who chooses to come" is recorded from 1560s. Middle English also had comeling "a comer, newcomer, stranger, guest" (mid-13c.), also "stray animal" (c. 1200).

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Definitions of comer

comer (n.)
someone with a promising future;
comer (n.)
someone who arrives (or has arrived);
Synonyms: arrival / arriver
From wordnet.princeton.edu