体の一部や突き出た部分を、鋭く切って取り除くこと。
"The surgeon had no choice but to chop off the infected finger to stop the spread of gangrene."
He raised his sword and chopped off the serpent's head with a single blow.
— J.R.R. Tolkien, The Hobbit (paraphrased scene — note: verify exact wording in source)