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.
: He always liked a little nosh between meals
To have a snack; nibble: noshing on more fruits and veggies
[1957+; fr Yiddish]