be as daft as a brush

be as daft as a brush

slang To act in a strange or silly way. Primarily heard in UK. Quit being as daft as a brush—it's too dangerous to play on this busy street!
See also: brush

be as daft as a brush

  (British informal)
if someone is as daft as a brush, they behave in a very silly way I remember him as a kid and he was as daft as a brush then.
See also: brush