secret weapon

Doreck’s Joe, the show’s secret weapon, slingshots across the stage.

Costco’s hot-dog-and-soda combo is “a secret weapon for the big-box warehouse club,” CNN’s Nathaniel Meyersohn wrote in 2018.

Freezer meals became my secret weapon.

He’s the movie’s secret weapon.

In the presence of carbon dioxide -- that pesky gas disrupting global climate systems -- our cells gain a secret weapon in the form of bicarbonate which helps keep pH levels balanced.