fluke

There they saw ferns with leaves instead of fronds, ferns that loved the sun, ferns that lacked sporangia altogether, and other bizarre flukes of nature.

One can argue that Mamdani’s dramatic win was a kind of fluke, a black-swan event that reveals more about the Democratic Party’s institutional weakness than about a major generational or ideological shift.

And almost halfway through the season, it’s looking less and less like a fluke.

The complications we’d encountered had been flukes; a healthy birth was possible, and pregnancy was safe for me.

A seven-year-old boy is in danger of losing sight in one eye because of an undiagnosed condition that was only picked up by a "fluke appointment" at the optician's.