Source : Webster's Revised Unabridged Dictionary (1913)

Deathbed \Death"bed\, n.
   The bed in which a person dies; hence, the closing hours of
   life of one who dies by sickness or the like; the last
   sickness.

         That often-quoted passage from Lord Hervey in which the
         Queen's deathbed is described.           --Thackeray.

Source : WordNet®

deathbed
     n 1: the last few hours before death
     2: the bed on which a person dies