› a point or level that it is very difficult to go past: The housing market declined as the boom in prices hit a brick wall.
› a problem or situation that is very difficult to solve: Their hopes to expand the company ran into a brick wall when they couldn't get a loan.
bang/hit your head against a brick wall › to try repeatedly to do something with no success: It felt like I was hitting my head against a brick wall because I had no support from my boss.