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rubstone

American  
[ruhb-stohn] / ˈrʌbˌstoʊn /

noun

  1. a stone, especially a whetstone, used for polishing or sharpening.

rubstone British  
/ ˈrʌbˌstəʊn /

noun

  1. a stone used for sharpening or smoothing, esp a whetstone

"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 rubstone

late Middle English word dating back to 1400–50; rub, stone

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.