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1A machine for cutting meat or food finely or into small pieces. In early use also: †a person who cuts meat or food in this way, or who makes meat or food into a hash (obsolete).
2US slang A waiter, waitress, or cook in a cheap restaurant or cafe.
Mid 19th century; earliest use found in Thomas Hood (1799–1845), poet and humorist. Partly from hash + -er.