n. a snack. (From German via Yiddish.) : I don't want a nosh. I need a whole meal.
in. to snack. : Every time I see you, you're noshing.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
nosh (v.)
1957, from Yiddish nashn "nibble," from M.H.G. naschen, from O.H.G. hnascon, nascon "to nibble," from P.Gmc. *khnaskwajanan. Earlier as a noun (1917) meaning "a restaurant," short for nosh-house.