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
Rodriguez put a capper on the four-run inning, driving in Rojas from second with a ground ball up the middle that hit the second-base bag and bounced away from Trejo for an RBI single.
From Seattle Times ● Apr. 20, 2024
The 2019 trilogy capper “Star Wars: The Rise of Skywalker” grossed $1.08 billion, significantly less than the two previous installments, and got poor reviews.
From Los Angeles Times ● Mar. 19, 2024
The capper would take the knife and try to open it, then he would say, "That is a dummy; it was not made to open."
From Forty Years a Gambler on the Mississippi by George H. Devol
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.
