a black mixture of mustard and rubber placed on a cloth and applied to the skin as a counterirritant.
Where Does The Phrase “Cut The Mustard” Come From?As with many slang and idiomatic phrases, the origin of cut the mustard isn't so ... clear-cut. But, let's see if we can't crack this etymological jar open just a bit.
Origin of mustard plaster
First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for mustard plaster
med a mixture of powdered black mustard seeds and an adhesive agent applied to the skin for its relaxing, stimulating, or counterirritant effects
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
Medicine definitions for mustard plaster
A medicinal plaster made with a pastelike mixture of powdered black mustard, flour, and water, used especially as a counterirritant.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.