c.1914). Slang peeper "eye" is from c.1700. Peeping Tom "a curious prying fellow" is from 1796; connection with Lady Godiva story dates only from 1837.
peep"make a short chirp," c.1400, probably altered from pipen (mid-13c.), ultimately imitative (cf. L. pipare, Fr. pepier, Ger. piepen, Lith. pypti, Czech pipati, Gk. pipos). The noun is attested from early 15c.; meaning "slightest sound or utterance" (usually in a negative context) is attested from 1903.
Peeper "tree frog" is first recorded 1857, Amer.Eng.