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bridgeboard

American  
[brij-bawrd, -bohrd] / ˈbrɪdʒˌbɔrd, -ˌboʊrd /

noun

  1. a notched board serving as a string or carriage for a stair.

bridgeboard British  
/ ˈbrɪdʒˌbɔːd /

noun

  1. Also called: cut string.  a board on both sides of a staircase that is cut to support the treads and risers

"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 bridgeboard

First recorded in 1875–80; bridge 1 + board

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.