/ · 1894 Brewer’s · S · Slap-dash
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In an off-hand manner. The allusion is to the method of colouring rooms by slapping and dashing the walls, so as to imitate paper. At one time slap-dash walls were very common.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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