any of several weedy plants belonging to the genus Brassica, of the mustard family, as charlock.
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 wild mustard
First recorded in 1590–1600
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for wild mustard
another name for charlock (def. 1)
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