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

Echosmith - 'Cool Kids' live on American Idol.

| by Shahlin Graves

Echosmith appeared on American Idol recently to perform their breakout single, 'Cool Kids', alongside contestant Joey Cook.

When will they release a new single? :(

Watch the performance below...