WordNet (r) 3.0 (2006):

rub off
    v 1: wear away [syn: abrade, corrade, abrase, rub down,
         rub off]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "rub off":
   ablate, abrade, abrase, bark, chafe, erase, erode, file, fray,
   frazzle, fret, gall, gnaw, gnaw away, grate, graze, grind, rasp,
   raze, rub away, rub out, scour, scrape, scrub, scuff, skin, tatter,
   wear, wear away, wear down, wear off, wear out, wear ragged,
   weather