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pertaining to everyday life
made up of a hodgepodge, including many ingredients
attested by 1824. Phrase everything but (or and) the kitchen sink is 1944, from World War II armed forces slang, in reference to intense bombardment.
Out for blood, our Navy throws everything but the kitchen sink at Jap vessels, warships and transports alike. [Shell fuel advertisement, "Life," Jan. 24, 1944]