run (one's) head against a brick wall

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run (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 running 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 running your head against a brick wall trying to convince everyone.
See also: brick, head, run, wall

run one's head against a brick wall

Fig. to be frustrated by coming up against an insurmountable obstacle. There is no point in running your head against a brick wall. If you can't succeed in this case, don't even try. I have been running my head against a brick wall about this problem long enough.
See also: brick, head, run, wall