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

Carly Rae Jepsen joins Bleachers on stage to sing 'Tiny Moves'.

Legend and icon Carly Rae Jepsen joined Jack Antonoff's Bleachers on stage at Day In Day Out Festival in Seattle to perform the band's track, 'Tiny Moves'.

The duo have been long-time collaborators with their work together stretching all the way back to 2012.