'wear down' definitions:

Definition of 'wear down'

(from WordNet)
verb
Exhaust or get tired through overuse or great strain or stress; "We wore ourselves out on this hike" [syn: tire, wear upon, tire out, wear, weary, jade, wear out, outwear, wear down, fag out, fag, fatigue] [ant: freshen, refresh, refreshen]
verb
Deteriorate through use or stress; "The constant friction wore out the cloth" [syn: wear, wear off, wear out, wear down, wear thin]

Synonyms of 'wear down'

From: Moby Thesaurus