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

Watch: Olivia Rodrigo's Sour Prom concert film.

Olivia Rodrigo went live with her Sour Prom concert film today, performing 'Brutal', 'Jealousy, Jealousy,' and 'Traitor' live for the very first time ever, and sneaking in some cameos from friends such as Madison Hu, Conan Gray, The Regrettes' Lydia Night, and Iris Apatow.

Watch the performance below...