Real Dictionary

cut off
phrasal verb: If you cut someone off when they are speaking, you interrupt them and stop them from speaking.
phrasal verb: If you cut something off, you remove it with a knife or a similar tool.
phrasal verb: If you get cut off when you are on the phone, the line is suddenly disconnected and you can no longer speak to the other person.
phrasal verb: To cut off a supply of something means to stop providing it or stop it being provided.
phrasal verb: To cut someone or something off means to separate them from things that they are normally connected with.

cut off in American English
to intercept
to separate from other parts by cutting; sever

cut off in British English
to remove by cutting
noun: the act of cutting off; limit or termination

cut-off in British English
noun: a limit or termination

cut-off in Mechanical Engineering
noun: A cut-off is a device that stops the flow of a fluid in a pipe or duct.