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boner

1 American  
[boh-ner] / ˈboʊ nər /

noun

  1. a person or thing that bones.

  2. Slang: Vulgar. an erection of the penis.

boner 2 American  
[boh-ner] / ˈboʊ nər /

noun

Slang.

  1. a foolish and obvious blunder; stupid mistake.

    Inviting both members of the newly divorced couple was a dreadful boner.
boner British  
/ ˈbəʊnə /

noun

  1. slang a blunder

  2. slang an erection of the penis

  3. a low-grade slaughtered animal suitable for use in pies, sausages, etc

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of boner1

First recorded in 1895–1900; bone + -er 1

Origin of boner1

An Americanism dating back to 1910–15; bone(head) + -er 1

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.