verb, preposition · to reduce the grade, quality, or classification level of something

信用评级机构将该国的信用等级从AAA降级为AA。

verb · to lower someone's rank, position, or status within an organization

他因违反公司规定被从经理降级为普通员工。

verb · to move a sports team to a lower league or division

由于赛季表现不佳，这支球队不幸降级了。