To amputate someone's arm or leg means to cut all or part of it off in an operation because it is diseased or badly damaged.
例句
To save his life, doctors amputated his legs...為了挽救他的生命，醫生們截掉了他的雙腿。He had to have one leg amputated above the knee.他的一條腿不得不從膝部以上截斷。
英漢詞典釋義
vt.
(用外科手術)截(肢等)
In the end they had to amputate his foot to free him from the wrecked car.最后他們不得不截斷他的腳才把他從撞壞的車中救出來。In these cases there is no choice but to amputate.在這些病例中,除了截肢別無他法。She had her leg amputated below the knee.她的一條腿自膝蓋以下被截掉了。