knock (one's) head against a/the wall
knock (one's) head against a/the 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 the 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
Farlex Dictionary of Idioms.
- knock (one's) head against a (brick) wall
- knock head against a brick wall
- beat (one's) head against a stone wall
- bang (one's) head against a brick wall
- bang (one's) head against a wall
- bang your head against a brick wall
- be banging (one's) head against a brick wall
- be banging your head against a brick wall
- be banging, etc. your head against a brick wall
- be hitting (one's) head against a (brick) wall