shame on (one)
An expression of condemnation, often an angry or disappointed one. Shame on you! You know better than to steal your sister's toys! Shame on her for taking advantage of your feelings like that! Fool me once, shame on you. Fool me twice, shame on me.
shame on you
a phrase scolding someone for being naughty. (*Typically said to a child or to an adult for a childish infraction.) John: I think I broke one of your figurines. Mary: Shame on you! John: I'll replace it, of course. Mary: Thanks, I sort of liked it. "Shame on you!" said Mary. "You should have known better!"
shame on you
see under for shame.
ˈshame on you, him, etc.
(spoken) an exclamation said to somebody who has behaved badly or done something they should be ashamed of: You forgot your mother’s birthday? Shame on you!