■ noun informal nonsense.
C15 (meaning ‘kitchen swill for pigs’): from hog + wash.
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Concise Oxford Thesaurus
hogwash
▶ noun (informal). See nonsense sense 1.
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Merriam-Webster Collegiate® Dictionary
hog·wash
Pronunciation: -ˌwȯsh, -ˌwäsh
Function: noun
Date: 15th century

1 : SWILL 2A, SLOP
2 : NONSENSE, BALDERDASH