Cases of word usage

1) (to cause something) to break, rub or fall into very small pieces (crumble)

2) to rub or scrape out (something) (erase)

3) to rub (one's teeth) together noisily because of anger or worry (gnash)

4) (a metal frame for holding coal etc in) a fireplace; to rub (especially food) into small pieces (grate)

5) to press, rub or push the nose against a person, thing (nuzzle)