One of the mysteries of the English language finally explained.
A person who is fond of snacking or nibbling on food; a snacker; a diner. In early use: specifically a person who samples food before buying it.
Early 20th century; earliest use found in Jewish Child. Probably partly from Yiddish nasher (from Middle High German nascher, nescher (German Nascher, (now rare) Näscher) person with a sweet tooth from naschen, neschen to eat dainty food or delicacies + -er), and partly from nosh + -er.
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