語源的にはgrit, grindと同じ。all grist to sb's millというフレーズでよく使われる。
英語の語源
grist
grist: see grind
grist (n.)
Old English grist "action of grinding; grain to be ground," perhaps related to grindan "to grind" (see grind (v.)), though OED calls this connection "difficult." Meaning "wheat which is to be ground" is early 15c., as is the figurative extension from this sense.
例文
1. A local filename is optionally qualified with grist ,a string value used to assure uniqueness.