3 occurrences in 3 dictionaries
Reference: Peep
American
In Isa 8:19, denotes the stifles, piping voice of necromancers.
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Fausets
Not "look" curiously, but "chirp" as young birds (Isa 8:19; 10:14). Necromancers made a faint cry come from the ground as of departed spirits. From the Latin pipio. The same Hebrew is translated "chatter" (Isa 38:14).