Meaning of “close/shut the door on sth” in the English Dictionary

british dictionary

"close/shut the door on sth" in British English

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close/shut the door on sth

to make it impossible for something to happen, especially a plan or a solution to a problem:

There are fears that this latest move might have closed the door on a peaceful solution.

(Definition of “close/shut the door on sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)