grind together(redirected from grinds together)
1. To cause two things to grate or scrape against each other. In this usage, a noun or pronoun is used between "grind" and "together." I wear a mouthguard at night so that I don't grind my teeth together.
2. To grate or scrape against something. I think these parts are grinding together and that's why this side looks so worn.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
grind something together
to rub things together. Stop grinding your teeth together. The stones ground together as we drove over them.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.