The Collaborative International Dictionary of English v.0.48:

Peep \Peep\ (p[=e]p), n.
   1. The cry of a young chicken; a chirp.
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   2. First outlook or appearance.
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            Oft have we seen him at the peep of dawn. --Gray.
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   3. A sly look; a look as through a crevice, or from a place
      of concealment.
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            To take t' other peep at the stars.   --Swift.
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   4. (Zool.)
      (a) Any small sandpiper, as the least sandpiper (Trigna
          minutilla).
      (b) The European meadow pipit (Anthus pratensis).
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   Peep show, a small show, or object exhibited, which is
      viewed through an orifice or a magnifying glass.

   Peep-o'-day boys, the Irish insurgents of 1784; -- so
      called from their visiting the house of the loyal Irish at
      day break in search of arms. [Cant]
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