Etymology
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nosh (v.)

"to snack, to eat between meals," 1957, from Yiddish nashn "nibble," from Middle High German naschen, from Old High German hnascon, nascon "to nibble," from Proto-Germanic *(g)naskon. Related: Noshed; noshing. Earlier as a noun (1917) meaning "a restaurant," short for nosh-house.

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Definitions of nosh
1
nosh (v.)
eat a snack; eat lightly;
Synonyms: snack
2
nosh (n.)
(Yiddish) a snack or light meal;
From wordnet.princeton.edu