be hitting (one's) head against a (brick) wall

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be hitting (one's) head against a (brick) wall

To be attempting, continuously and fruitlessly, to accomplish some task or achieve some goal that is or seems ultimately hopeless. I feel like I've been hitting my head against a brick wall trying to understand this math equation. Calculating it like that is like hitting your head against a wall. Let me show you a shortcut.
See also: head, hit, wall