Send somebody to Coventry
Definition 1 of 1
Pro Tip 1/3Social Punishment
This phrase means to socially isolate someone as a form of punishment without any physical actions. 
She spread rumors, so the class sent her to Coventry.
Pro Tip 2/3British Origin
The phrase is uniquely British, from a historical event during the English Civil War. 
The new student didn't understand when he was sent to Coventry, since he grew up in Canada.
Pro Tip 3/3Silent Treatment
It's an informal way to refer to the act of giving someone the silent treatment. 
After the argument, Lara sent her boyfriend to Coventry.