pi·geon·hole /ˈpɪʤənˌhol/
  鴿棚,出入孔,分類架(vt.)分類,歸檔
  Pi·geon·hole 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.
  Pi·geon·hole, v. t. 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.
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  pigeonhole
       n 1: a specific (often simplistic) category
       2: a small compartment [syn: cubbyhole]
       v 1: place into a small compartment
       2: treat or classify according to a mental stereotype; "I was
          stereotyped as a lazy Southern European" [syn: stereotype,
           stamp]