wear down wear down /wɛr daʊn/

verb

1. () Exhaust or get tired through overuse or great strain or stress  ( fag [Informal] , fag out [Informal, British] , fatigue , jade , outwear , wear , wear down , wear upon , weary , tire , tire out , wear out )
   exhaust or get tired through overuse or great strain or stress
    We wore ourselves out on this hike
   We wore ourselves out on this hike
   
2. Deteriorate through use or stress  ( wear down , wear off , wear out , wear , wear thin )
   deteriorate through use or stress
    The constant friction wore out the cloth
   The constant friction wore out the cloth