磨损 (mó sǔn): to suffer wear and tear; to deteriorate through use; to wear out

I've worn these shoes for three years, and the soles are severely worn down; my feet hurt when I walk.

Due to long-term friction, the gears inside the machine wear out quickly and must be replaced regularly.

Archaeologists found that the inscription on this stone tablet has been worn away by weathering and is now hard to read.

After car tires wear down to a certain extent, their grip decreases, and it's easy to skid when driving in the rain.

This sofa has been used for ten years; the fabric on the surface is badly worn, and some parts are torn.