to send someone to prison

He was sent down for armed robbery. 他因持枪抢劫被判入狱。

She was sent down for three years. 她被判入狱3年。

to ask someone to leave a college or university before the end of the course because they have done something wrong

She was sent down from Oxford for taking drugs. 她因为吸毒被牛津大学开除了。