Grind : v. tr. To grind (grains) with a millstone.
To break (with blows), to beat.
To grind with sticks: to beat with cudgels.
Grind pepper: insult.
Formerly, grinding a tune meant playing it on a hand-cranked instrument like a barrel organ, a hurdy-gurdy).
In grind: work hard, pedal vigorously (racing cyclist).
In the middle of prostitution, the expression "in grind" means "to do the sidewalk"
“En remoudre”: redo the sidewalk after a more or less long interruption.
Grind: for a woman, it's making love while sitting on her lover.
To be a prostitute.