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 on wood
- knock (someone) off their feet
- knock (someone) down (to size)
- knock oneself out
- knock some heads together
- knock off work
- knock down the price of (something)
- knock (something) off
- knock (someone or something) out
- knock the props out from under (someone)
- knock (someone) over with a feather
- knock (someone) off
- knock-down-drag-out fight
- knock (someone) dead
- knock about