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

Watch: Benny Blanco and Gracie Abrams perform 'Unlearn' live for James Corden.

Having just released their new collaboration, 'Unlearn', Benny Blanco and Gracie Abrams performed the new song for The Late Late Show with James Corden, each performing parts of the song on keyboard.

Watch the performance below...