Meaning of “be banging your head against a brick wall” - Learner’s Dictionary

be banging your head against a brick wall

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.

(Definition of “be banging your head against a brick wall” from the Cambridge Learner’s Dictionary © Cambridge University Press)

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