Etymology Inherited from Middle English gryndynge. By surface analysis, grind + -ing.
1
Of or pertaining to the act or gratingly sound of grinding.
The meeting came to a grinding halt when the two sides could not agree.
2
Relentlessly taxing; burdensome; exacting to the point of exhaustion.
A week of filled with grinding toil.
I saw none of the grinding poverty to which I had become inured, no beggars, no one passed out in the streets or homeless people forced to camp out in parks and doorways.1983 April 16, John Kyper, “Cuba: A Little Sex, No Drugs, and Lotsa Rock 'n Roll”, in Gay Community News, page 8: