Pigeonhole /(?)/

Pi·geon·hole

Pigeonhole

n.
  1. 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.

Pigeonhole

v. t.
  1. 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.