peep (n.2)youdaoicibaDictYouDict
"short chirp," early 15c., from peep (v.2); meaning "slightest sound or utterance" (usually in a negative context) is attested from 1903. Meaning "young chicken" is from 1680s. The marshmallow peeps confection are said to date from 1950s.
peeper (n.)youdaoicibaDictYouDict
1650s, "one who peeps," agent noun from peep (v.1). Slang meaning "eye" is c. 1700. From 1590s as "young chicken" and 1857 as "tree frog" (American English), both from peep (v.2).
raven (n.)youdaoicibaDictYouDict
Old English hræfn (Mercian), hrefn; hræfn (Northumbrian, West Saxon), from Proto-Germanic *khrabanaz (cognates: Old Norse hrafn, Danish ravn, Dutch raaf, Old High German hraban, German Rabe "raven," Old English hroc "rook"), from PIE root *ker- (2), imitative of harsh sounds (cognates: Latin crepare "to creak, clatter," cornix "crow," corvus "raven;" Greek korax "raven," korone "crow;" Old Church Slavonic kruku "raven;" Lithuanian krauklys "crow").
Raven mythology shows considerable homogeneity throughout the whole area [northern regions of the northern hemisphere] in spite of differences in detail. The Raven peeps forth from the mists of time and the thickets of mythology, as a bird of slaughter, a storm bird, a sun and fire bird, a messenger, an oracular figure and a craftsman or culture hero. [Edward A. Armstrong, "The Folklore of Birds," 1958]
Old English also used hræmn, hremm. The raven standard was the flag of the Danish Vikings. The Quran connects the raven with Cain's murder of Abel; but in Christianity the bird plays a positive role in the stories of St. Benedict, St. Paul the Hermit, St. Vincent, etc. It was anciently believed to live to great old age, but the ancients also believed it wanting in parental care. The vikings, like Noah, were said to have used the raven to discover land. "When uncertain of their course they let one loose, and steered the vessel in his track, deeming that the land lay in the direction of his flight; if he returned to the ship, it was supposed to be at a distance" [Charles Swainson, "The Folk Lore and Provincial Names of British Birds," London, 1886].
snoop (n.)youdaoicibaDictYouDict
1891, "act of snooping," from snoop (v.). Meaning "one who snoops" is from 1929; meaning "detective" is from 1942. snooper "one who pries or peeps" is from 1889.