fluke

A lucky or improbable occurrence that could probably never be repeated.

We've classified by a fluke; actually, the first goal was just a total fluke.

“[…] That's the first time in the history of Bierce's Cove that two men made that jump on the same sea. And all the risk was yours, coming last.” “It was a fluke,” Billy insisted.

To obtain a successful outcome by pure chance.

I fluked a pass in the multiple-choice exam.

To fortuitously pot a ball in an unintended way.

He fluked the other red into the middle pocket, despite the double kiss.

A summer flounder (Paralichthys dentatus)

A trematode; a parasitic flatworm of the class Trematoda, related to tapeworms (class Cestoda).

The man became infected with flukes after eating a meal of raw fish.