brickwall

Noun

brick wall (plural brick walls)

1. Used other than figuratively or idiomatically: see brick, wall. A wall made of bricks.
2. (figuratively) 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.
3. (sound engineering) 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, Daniel M. Thompson, Understanding Audio, →ISBN
4. (figuratively) Someone who is silent or unresponsive.
   • When mama says she doesn't talk, she means it. She's a brick wall.1987, National Thespian Dramatic Honor Society for High Schools, Dramatics, volume 59, page 23

See all 8 meanings of brick wall