Origin of gristMiddle English from OE, akin to Old High German grist- in gristgrimmon, to gnash the teeth: for probably Indo-European base see grime
grist to someone's mill
- Grain or a quantity of grain for grinding.
- Ground grain.
Origin of gristMiddle English from Old English grīst ; see ghrendh- in Indo-European roots.
From Middle English grist, gryst, from Old English grist, gyrst (“the action of grinding, corn for grinding, gnashing”), from a derivative of Proto-Germanic *gredaną (“to crunch”), from Proto-Indo-European *ghrēu- (“to rub, grind”). Cognate with Old Saxon gristgrimmo (“gnashing of the teeth”), German Griesgram (“a grumbler, a grouch, peevishness, misery”), Old English gristel (“gristle”). More at gristle.