Pigeonhole

Part of speech: noun (n.)

A small compartment in a desk or case for the keeping of letters, documents, etc.; -- so called from the resemblance of a row of them to the compartments in a dovecote. Burke.

Part of speech: verb (v.)

To place in the pigeonhole of a case or cabinet; hence, to put away; to lay aside indefinitely; as, to pigeonhole a letter or a report.