(~s)
A ~ is a wall that consists of two separate walls with a space between them. Cavity walls help to keep out noise and cold. (mainly BRIT)
...~ insulation.
N-COUNT: oft N n
(~s)
A ~ is a wall that consists of two separate walls with a space between them. Cavity walls help to keep out noise and cold. (mainly BRIT)
...~ insulation.
N-COUNT: oft N n
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012