brick wall verb 4noun 3forms 3 verb4 •To build a brick wall around.They forcefully imprisoned her in a decorative room and brick walled it. — 2013 •To be uncooperative and unresponsive.They wanted to know how successful the attack had been. But you brick-walled them. — 2012 •To halt or limit abruptly.The driver stopped the cab on the spot, brick-walled it then and there. — 2012 •To filter using a brick wall filter. noun3 •(figurative) An obstacle.The investigators came up against a brick wall in their search for the missing money when they discovered it had been transferred overseas. •(figurative) Someone who is silent or unresponsive.When mama says she doesn't talk, she means it. She's a brick wall. — 1987 •A type of anti-aliasing filter with a steep cutoff.One of the first problems with the digital audio process is the use of brick wall filters with very steep slopes for anti-aliasing and anti-imaging purposes. — 2005 formsbrick walled · brick walling · brick walls