gradually making something weaker and destroying it, especially the strength or confidence of an enemy by repeatedly attacking it

Terrorist groups and the government have been engaged in a costly war of attrition since 2008. 自2008年以来，恐怖主义组织和政府之间一直在进行两败俱伤的消耗战。

a reduction in the number of people who work for an organization that is achieved by not replacing those people who leave

the people who leave an educational or training course before it has finished

The high attrition rates on the degree programs are a cause for concern. 学位课程的高辍学率令人担忧。