A light snack or something quick to eat, or to eat snacks casually.
From Yiddish 'nosh' or 'noshn' meaning 'to snack,' possibly from Hebrew 'natash' meaning 'to nibble.' The word entered American English in the mid-20th century.
Like 'bagel' and 'schmooze,' 'nosh' is Yiddish slang that became mainstream American English—these words brought an entirely different flavor and casualness to English compared to Germanic or Romance-based vocabulary.
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