The phrase "mechanical breakdown" refers to a situation when a machine or device stops working properly or completely due to a problem with its moving or working parts. Full definition
The level of coverage provided for car repairs will depend upon the type of mechanical breakdown insurance policy you actually purchase. (autos.com)
This, in combination with year round specialty sport training, causes a cascade of hazardous chronic inflammation and mechanical breakdown of tissues, especially those still developing in younger athletes. (weckmethod.com)
NOTE: Not all car insurance companies offer mechanical breakdown coverage. (dmv.org)