wear and tear
noun [ U ] uk/ˌweər ən ˈteər/ us/ˌwer ən ˈter/
（一定时期内的）磨损，损耗
the damage that happens to an object in ordinary use during a period
Seat covers on buses take a lot of wear and tear. 火车上的座套磨损比较严重。
Compare: depreciation
See also: wear noun (USE)tear noun (HOLE)