|Easton's Bible Dictionary|
(Hebrews kelub', Jeremiah 5:27, marg. "coop;" rendered "basket" in Amos 8:1), a basket of wicker-work in which birds were placed after being caught. In Revelation 18:2 it is the rendering of the Greek phulake, properly a prison or place of confinement.
Noah Webster's Dictionary
1. (n.) A box or enclosure, wholly or partly of openwork, in wood or metal, used for confining birds or other animals.
2. (n.) A place of confinement for malefactors
3. (n.) An outer framework of timber, inclosing something within it; as, the cage of a staircase.
4. (n.) A skeleton frame to limit the motion of a loose piece, as a ball valve.
5. (n.) A wirework strainer, used in connection with pumps and pipes.
6. (n.) The box, bucket, or enclosed platform of a lift or elevator; a cage like structure moving in a shaft.
7. (n.) The drum on which the rope is wound in a hoisting whim.
8. (n.) The catcher's wire mask.
9. (v. i.) To confine in, or as in, a cage; to shut up or confine.
Int. Standard Bible Encyclopedia
kaj (kelubh; phulake): The earliest known form of cage made to confine a bird, for the pleasure of its song or the beauty of its coloring, was a crude affair of willows or other pliable twigs. Later cages were made of pottery, and now they are mostly made of wire. References in the Bible make it very clear that people were accustomed to confine in cages such birds as they especially prized for pets, or to detain them for market purposes. James indicated that cages were common when he wrote (Jam 3:7): "For every kind of beasts and birds. is tamed, and hath been tamed by mankind." In Job (Job 41:5) we find these lines "Wilt thou play with him as with a bird? Or wilt thou bind him for thy maidens?" The only way to play with a bird is to confine it so that it grows accustomed to you and thus loses fear. Jeremiah compared the civil state of Judah to a "cage (crate) full of birds" (Jeremiah 5:27), "the houses of the rich being stuffed with craftily-obtained wealth and articles of luxury" (HDB). The sale of sparrows as an article of food still continues in the eastern markets. Jesus referred to this (Matthew 10:29) and it was He who entered the temple and overthrew "the seats of them that sold the doves" (Matthew 21:12). In Revelation 18:2 we find a reference to "a hold (the King James Version "cage") of every unclean and hateful bird." See also Ecclesiasticus 11:30.
Cage (3 Occurrences)
Revelation 18:2 And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become the habitation of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird. (KJV WBS)
Jeremiah 5:27 As a cage is full of birds, so are their houses full of deceit: therefore they are become great, and grew rich. (WEB KJV JPS ASV DBY WBS YLT NAS NIV)
Ezekiel 19:9 They put him in a cage with hooks, and brought him to the king of Babylon; they brought him into strongholds, that his voice should no more be heard on the mountains of Israel. (WEB JPS ASV DBY NAS RSV NIV)