Source : Webster's Revised Unabridged Dictionary (1913)

Peep \Peep\, v. i. [imp. & p. p. {Peeped}; p. pr. & vb. n.
   {Peeping}.] [Of imitative origin; cf. OE. pipen, F. piper,
   p['e]pier, L. pipire, pipare, pipiare, D. & G. piepen. Senses
   2 and 3 perhaps come from a transfer of sense from the sound
   which chickens make upon the first breaking of the shell to
   the act accompanying it; or perhaps from the influence of
   peek, or peak. Cf. {Pipe}.]
   1. To cry, as a chicken hatching or newly hatched; to chirp;
      to cheep.

            There was none that moved the wing, or opened the
            mouth, or peeped.                     --Is. x. 14.

   2. To begin to appear; to look forth from concealment; to
      make the first appearance.

            When flowers first peeped, and trees did blossoms
            bear.                                 --Dryden.