Strong's #6850: tsaphaph (pronounced tsaw-faf')
a primitive root; to coo or chirp (as a bird):--chatter, peep, whisper.
Brown-Driver-Briggs Hebrew Lexicon:
1) (Pilpel) to chirp, peep
1a) of birds
1b) of ghosts
Part of Speech: verb
Relation: a primitive root
This word is used 4 times:
Isaiah 8:19: "them that have familiar spirits, and unto wizards that peep, and that mutter: should not a people seek"
Isaiah 10:14: "the wing, or opened the mouth, or peeped."
Isaiah 29:4: "and thy voice shall be, as of one that hath a familiar spirit, out of the ground, and thy speech shall whisper out of the dust."
Isaiah 38:14: "Like a crane or a swallow, so did I chatter: I did mourn as a dove: mine eyes fail"