Fluke

[flook] /fluk/

noun
1.
the part of an anchor that catches in the ground, especially the flat triangular piece at the end of each arm.
2.
a barb, or the barbed head, of a harpoon, spear, arrow, or the like.
3.
either half of the triangular tail of a whale.
[flook] /fluk/
noun
1.
an accidental advantage; stroke of good luck:
He got the job by a fluke.
2.
an accident or chance happening.
3.
an accidentally successful stroke, as in billiards.
[flook] /fluk/
noun
1.
any of several American flounders of the genus Paralichthys, especially P. dentatus, found in the Atlantic Ocean.
2.
any of various other flatfishes.
3.
a trematode.
/fluːk/
noun
1.
Also called flue. a flat bladelike projection at the end of the arm of an anchor
2.
either of the two lobes of the tail of a whale or related animal
3.
Also called flue. the barb or barbed head of a harpoon, arrow, etc
/fluːk/
noun
1.
an accidental stroke of luck
2.
any chance happening
verb
3.
(transitive) to gain, make, or hit by a fluke
/fluːk/
noun
1.
any parasitic flatworm, such as the blood fluke and liver fluke, of the classes Monogenea and Digenea (formerly united in a single class Trematoda)
2.
another name for flounder2 (sense 1)
n.

“flat end of an arm of an anchor,” 1560s, perhaps from fluke (n.3) on resemblance of shape, or from Low German flügel “wing.” Meaning “whale’s tail” (in plural, flukes) is 1725.

“lucky stroke, chance hit,” 1857, originally a lucky shot at billiards, of uncertain origin.

“flatfish,” Old English floc “flatfish,” related to Old Norse floke “flatfish,” flak “disk, floe” (see flake (n.)). The parasite worm (1660s) so called from resemblance of shape.

fluke 1 (flōōk)
n.
See trematode.
fluke
(flk)

noun

A good or bad stroke of luck; an extraordinary and unpredictable event: My winning was just a fluke/ We got onto that flight by a fluke

[1857+; origin unknown, but perhaps fr fluke, ”flatfish,” by way of an early 1800s British slang sense of flat, ”easy dupe, victim,” altered in billiards jargon to fluke, to characterize the seeming chicanery of a good stroke of luck]