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scumboard

American  
[skuhm-bawrd, -bohrd] / ˈskʌmˌbɔrd, -ˌboʊrd /

noun

  1. a board or strip of material partly immersed in flowing water to hold back scum.

Etymology

Origin of scumboard

First recorded in 1895–1900; scum + 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.