exhaust or get tired through overuse or great strain or stress;
"We wore ourselves out on this hike"
deteriorate through use or stress;
"The constant friction wore out the cloth"
- Her defences will wear down after a few weeks in prison.
- The strategy was designed to wear down the enemy's resistance.
- The tread on the tyres has (been) worn down to a dangerous level.
- wear down 使磨损, 使厌倦...