Source : Webster's Revised Unabridged Dictionary (1913)

Roost \Roost\, v. i. [imp. & p. p. {Roosted}; p. pr. & vb. n.
   {Roosting}.]
   1. To sit, rest, or sleep, as fowls on a pole, limb of a
      tree, etc.; to perch. --Wordsworth.

   2. Fig.; To lodge; to rest; to sleep.

            O, let me where thy roof my soul hath hid, O, let me
            roost and nestle there.               --Herbert.