black boxSEE DEFINITION OF black box
EXAMPLES FROM THE WEB FOR BLACK BOX
On the subject of the black box Mrs. Damer's brain was turned.
He picked up the black box that generated his protective screen.
The redheaded man was crouching in the far corner of the black box.
The mathematician set the black box on the desk top and released the lid.
Connected with this arrangement, was a black box of many uses.
"You'd better get some rest, Ned Vince," came the answer from the black box.
The black box was now lying in the sand among the streaming plants.
She had been about to betray the secret of the black box up there in her room.
Springing to her feet, she dragged the black box from its hiding place.
It had lain beside the tankard and the money in the black box.