Halibut
Origin
From Middle English haly ("holy") + obsolete butt ("flatfish"), since the fish was often eaten on holy days.
Full definition of halibut
Noun
- A large flatfish of the genus Hippoglossus, which sometimes leaves the ocean floor and swims vertically.
- 1960, P. G. Wodehouse, Jeeves in the Offing, ... she frowned a displeased frown and told me for heaven's sake to stop goggling like a dead halibut.