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3. knock (one's) head against a (brick) wall

knock (one's) head against a (brick) wall

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knock (one's) head against a (brick) wall

To attempt continuously and fruitlessly to accomplish some task or achieve some goal that is or seems ultimately hopeless. I feel like I've been knocking my head against a brick wall trying to understand this math equation. Some people are never going to agree with you on this, so it's no use knocking your head against a wall trying to convince everyone.

See also: head, knock, wall