usage: make a grating or grinding sound by rubbing together; "grate one's teeth in anger"
3. labor, labour, toil, fag, travail, grind, drudge, dig, moil, work, do work
usage: work hard; "She was digging away at her math homework"; "Lexicographers drudge all day long"
4. grind, dance, trip the light fantastic, trip the light fantastic toe
usage: dance by rotating the pelvis in an erotically suggestive way, often while in contact with one's partner such that the dancers' legs are interlaced