Commentary for Job 40:31

Will you fulfill Will you fulfill your desire and make tents of his skin?

or a shade of fishes of his head Will you make from his head a shade of fish? This is a repetitious expression.

a shade Heb. צִלְצַל, a tent of fish. A tent made from his head is called a shade of fish because it is made from him.

צִלְצַל is ombre in French. It is an expression of shadow, and that is one of the double words, like: green (ירקרק), red (אדמדם) [both in Lev. 13:49], twisted (פתלתל) [Deut. 32:5], tattoo (קעקע) [Lev. 19:28].