once-in-a-lifetime

The 19-year-old said when Sopal chose to dance to Sapphire on the show, she "really wanted a dhol player" and a quick internet search led to his "once in a lifetime" experience.

The after-action report called the January blaze a “once in a lifetime cataclysmic event” and praised the heroic actions of many officers, but said the LAPD’s missteps presented a “valuable learning opportunity” with more climate-related disasters likely looming in the future.

"It's a once in a lifetime opportunity."

“The confluence of issues is once in a lifetime,” said Sam Fiorani, an analyst with consulting firm AutoForecast Solutions.

He said: "This is a once in a lifetime opportunity to actually start that reform that policing needs, and it will be a missed opportunity if it's not properly funded from the start."