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

Watch: Billie Eilish & Finneas' Oscars 2020 performance.

Billie Eilish and Finneas performed a cover of The Beatles classic 'Yesterday' to soundtrack the Oscars 2020 'In Memoriam' section of tonight's awards show.

Watch the performance below...