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- be as daft as a brush
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!
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.