CUSH in OT designates Ethiopia, and is the only name used there for that region. It is the same as the Egyptian Kash or Kesh. Broadly speaking, it answers to the modern Nubia. More specifically, the Egyptian Kash extended southwards from the first Cataract at Syene (Eze 29:10), and in the periods of widest extension of the empire it embraced a portion of the Sudan. It was conquered and annexed by Egypt under the 12th Dynasty (c. b.c. 2000) and remained normally a subject country. After the decline of the 22nd (Libyan) Dynasty, the Cushites became powerful and gradually encroached on northern Egypt, so that at length an Ethiopian dynasty was established (the 25th, 728
See Verses Found in Dictionary
And the name of the second river is Gihon: that is it which surrounds the whole land of Cush.
And the sons of Ham: Cush, and Mizraim, and Phut, and Canaan.
And Cush begot Nimrod: he began to be mighty on the earth.
Then said Joab to the Cushite, Go, tell the king what thou hast seen. And the Cushite bowed himself to Joab, and ran.
And he heard say of Tirhakah king of Ethiopia, Behold, he has come forth to make war with thee. And he sent messengers again to Hezekiah, saying,
And Zerah the Ethiopian came out against him with a host of a thousand thousand, and three hundred chariots, and he came to Mareshah.
And Jehovah stirred up against Jehoram the spirit of the Philistines, and of the Arabians, who are near the Ethiopians;
Ha! land shadowing with wings, which art beyond the rivers of Cush,
Can an Ethiopian change his skin, or a leopard his spots? Then may ye also do good, who are accustomed to do evil.
And all the princes sent Jehudi the son of Nethaniah, the son of Shelemiah, the son of Cushi, unto Baruch, saying, Take in thy hand the roll in which thou hast read in the ears of the people, and come. And Baruch the son of Nerijah took the roll in his hand, and came unto them.
And Ebed-melech the Ethiopian, a eunuch who was in the king's house, heard that they had put Jeremiah in the dungeon now the king was sitting in the gate of Benjamin,
Therefore behold, I am against thee, and against thy rivers, and I will make the land of Egypt deserts of wasteness and desolation, from Migdol to Syene, even unto the border of Ethiopia.
Are ye not as children of the Ethiopians unto me, O children of Israel? saith Jehovah. Have not I brought up Israel out of the land of Egypt? and the Philistines from Caphtor, and the Syrians from Kir?