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be banging your head against a brick wall

Definition

to do, say, or ask for something repeatedly but to be unable to change a situation: I keep asking her not to park there, but it's like banging my head against a brick wall. → See also hit the nail on the head → See also a roof over your head → See also off the top of your head
(Definition of be banging your head against a brick wall from the Cambridge Learner's Dictionary © Cambridge University Press)

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