Of uncertain or obscure origin, perhaps dialectal. It seems to have originally referred to a lucky shot at billiards. Possibly connected to fluke#Etymology_3, referring to whales' use of flukes to move rapidly.
From Old English flōc ("flatfish"), of Germanic origin, related to German flach ("flat"), Old Norse floke ("flatfish"), all ultimately from Proto-Germanic *flakaz.
Possibly as Etymology 2 or from Middle Low German flügel ("wing"), from Old High German vlügel, from Proto-Germanic *flugilaz ("wing").
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