Today’s lesson of colloquial expression
631. to bang your head against the wall 悩みを追い払おうとする行為
- this means to waste your time repeatedly trying to do something which you can’t do
1. If you’re having trouble finding the solution, it’s better to ask questions than to sit and bang your head against the wall all day.
2. The students have been banging their heads against the wall all day over this math problem. I don’t think any of them will be able to solve it.