hinge
  Pronunciation: (hinj), [key]    — n., v., hinged, hing•ing. 
  
  
 —n.  - a jointed device or flexible piece on which a door, gate, shutter, lid, or other attached part turns, swings, or moves.  
  - a natural anatomical joint at which motion occurs around a transverse axis, as that of the knee or a bivalve shell.  
  - that on which something is based or depends; pivotal consideration or factor.  
  - Also calleda gummed sticker for affixing a stamp to a page of an album, so folded as to form a hinge, allowing the stamp to be raised to reveal the text beneath.  
  
  
 —v.i.  - to be dependent or contingent on, or as if on, a hinge (usually fol. by on or upon): Everything hinges on his decision. 
  
  
 —v.t.  - to furnish with or attach by a hinge or hinges.  
  - to attach as if by a hinge.  
  - to make or consider as dependent upon; predicate: He hinged his action on future sales. 
  
  
  Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.