be banging your head against a brick wall

Meaning

1. be banging, etc. your head against a brick wall

   to keep trying to do sth that will never be successful

   Trying to reason with them was like banging my head against a brick wall.

From the same entry

• a head
• bang your heads together
• be head and shoulders above
• bite head off
• bring to a head
• bury your head in the sand
• can't make head nor tail of
• do head in
• do standing on your head
• from head to foot
• get your head down
• get your head round