fluke
noun
°A lucky or improbable occurrence, with the implication that the occurrence could not be repeated.
"The first goal was just a fluke."
°Either of the two lobes of a whale's or similar creature's tail.
"The dolphin had an open wound on the left fluke of its tail where the propeller had injured it."
verb
°To obtain a successful outcome by pure chance.
"I fluked a pass in the multiple-choice exam."
°(snooker) To fortuitously pot a ball in an unintended way.
"He fluked the other red into the middle pocket, despite the double kiss."