knock one's head against the wall
тратить время, пытаясь безуспешно сделать что-либо
I've been knocking my head against the wall for a week, trying to write a good essay.
Другие идиомы:
- knock (someone's) block off
- knock down the price of (something)
- Knock it off!
- knock the props out from under (someone)
- knock off work
- knock (someone) around
- knock oneself out
- knock (someone) dead
- knock (someone) off their feet
- knock about
- knock some heads together
- knock (something) off
- knock (someone) off
- knock-down-drag-out fight
- knock on wood