The Collaborative International Dictionary
look-down
lookdown \look"down`\, look-down \look"-down`\, n. (Zo["o]l.) A fish ( Selene vomer) similar to the moonfish but with eyes high on the truncated forehead; it was also called moonfish at one time.
Syn: Selene vomer.
Douglas Harper's Etymology Dictionary
Usage examples of "look-down".
The Soviet bombers climbed steeply on afterburner, activating their own look-down radars to find targets for their missiles.
Those had been air strikes, whatever Cuernavaca might have been, but no one had explained how the aircraft in question had evaded look-down radar, satellite reconnaissance, and plain old human eyesight.