The Collaborative International Dictionary of English v.0.48:
Peep \Peep\ (p[=e]p), n.
1. The cry of a young chicken; a chirp.
2. First outlook or appearance.
Oft have we seen him at the peep of dawn. --Gray.
3. A sly look; a look as through a crevice, or from a place
To take t' other peep at the stars. --Swift.
(a) Any small sandpiper, as the least sandpiper (Trigna
(b) The European meadow pipit (Anthus pratensis).
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]