coup de main - noun
\ˌkü-də-ˈmaⁿ
Definition of coup de main : an attack that achieves complete surprise.

Watch Billie Eilish and Hayley Williams perform 'Misery Business' and 'Happier Than Ever' at Coachella 2022.

Capping off a second weekend headlining Coachella 2022, Billie Eilish delighted fans with the special guest of Paramore frontwoman Hayley Williams - bringing her out to perform Paramore's 'Misery Business', as well as Eilish's own 'Happier Than Ever'.