a red face

A feeling or expression of intense embarrassment. He's going to have a red face once he realizes that the mechanic he yelled at over the phone wasn't the one who worked on his car. I was left with a red face after I accidentally sent that private email to the entire office. The candidate had quite a red face when she realized her microphone had been on while she'd been discussing personal family matters backstage.

a red ˈface

(informal) embarrassment: There are going to be a lot of red faces at the bank when they discover their mistake.