One that arrives or comes: free food for all comers. (noun)
One showing promise of attaining success: a political comer. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "comer" in a sentence
"Luv luv luv that Jay Baruchel, a home grown Canadian boy and up and comer, is in this video."
"Calling him an up-and-comer is an understatement - he's already a phenomenal actor who has been in quite a bit, you just haven't come to memorize his name and his face yet, but you will soon enough."
"Strombel informs Sondra that Peter Lyman, a handsome London aristocrat and political up-and-comer, is actually a serial murderer known as the Tarot Card Killer."