doorstop

from WordNet (r) 3.0 (2006)

doorstop
    n 1: a stop that keeps open doors from moving [syn: {doorstop},
         {doorstopper}]

from The Collaborative International Dictionary of English v.0.48

doorstop \door"stop`\, n. (Carp.)
   The block or strip of wood or similar material which stops,
   at the right place, the shutting of a door; any object used
   to stop open doors from moving.
   [1913 Webster]

from Jargon File (4.4.4, 14 Aug 2003)

doorstop
 n.

   Used to describe equipment that is non-functional and halfway expected
   to remain so, especially obsolete equipment kept around for political
   reasons or ostensibly as a backup. Compare {boat anchor}.

from The Free On-line Dictionary of Computing (8 July 2008)

doorstop

   Used to describe equipment that is non-functional and halfway
   expected to remain so, especially obsolete equipment kept
   around for political reasons or ostensibly as a backup.  "When
   we get another Wyse-50 in here, that ADM 3 will turn into a
   doorstop."

   Compare {boat anchor}.

   [{Jargon File}]

from Moby Thesaurus II by Grady Ward, 1.0

31 Moby Thesaurus words for "doorstop":
      arrest, bearing rein, bit, brake, chain, check, checkrein, chock,
      clog, countercheck, curb, curb bit, damper, drag, drag sail,
      drift anchor, drift sail, drogue, fetter, holdback, martingale,
      pelham, remora, scotch, sea anchor, shackle, snaffle, spoke, stay,
      stop, trammel

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