have heard the last of

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have heard/seen the last of somebody/something

if you have heard the last of someone or something unpleasant, they will not cause you any more problems in the future (often negative) It's a worrying problem and I dare say we haven't heard the last of it. He's a very unpleasant man. I sincerely hope we've seen the last of him.
See also: have, hear, last, of