capper
Americannoun
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a person or thing that caps.
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Also called topper. something that completes or adds to what has preceded it.
The capper was that we didn't know each other after all.
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Slang. an informer, especially for gamblers.
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Slang. a by-bidder at an auction.
Etymology
Origin of capper
1350–1400 (for sense “cap maker”); 1580–90 capper ( for def. 1 ); Middle English; see cap 1, -er 1
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
“This should put a capper, in our opinion, on blue-sky hopes for substantial multiple expansion,” he wrote.
From MarketWatch • Feb. 5, 2026
The capper came on Monday when Liverpool shelled out around $170 million for Alexander Isak, a 26-year-old from Sweden, signed from Newcastle, another top-five club.
From The Wall Street Journal • Sep. 2, 2025
As a capper, right when Eve starts to drive away, there’s a neat crane move with a motivation I don’t want to spoil.
From Los Angeles Times • Jun. 5, 2025
As a capper, he fired Admiral Linda Fagan from commanding the Coast Guard.
From Salon • Jan. 23, 2025
I commenced to play them over, and had him guessing lively, when up stepped the capper and took a look at the cards, and said, "I will bet you $500 I can turn the king."
From Forty Years a Gambler on the Mississippi by Devol, George H.
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
