Dictionary.com
Thesaurus.com

breastsummer

American  
[bres-suhm-er, brest-, bres-uh-mer] / ˈbrɛsˌsʌm ər, ˈbrɛst-, ˈbrɛs ə mər /

noun

Architecture.

  1. a horizontal beam supporting an exterior wall over an opening, as a shop window.

Etymology

Origin of breastsummer

First recorded in 1605–15; breast + summer 2

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.