Imbasing of Money
Hale, in Pleas of the Crown (i. 102), states that this con- sists of " mixing the species with an alloy below the standard of sterling."
Sir Thomas More in his Utopia , 1551, uses the phrase " Enhauncynge and imbas- yng of coyne. " See Debased and Embase.
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)