Spanish phrase
¡Esto no se hace!
Meaning
You mustn't do that!
When to use it
A strong rebuke that an action is unacceptable. Used to sharply scold someone for a specific act, often with anger or surprise and unsuitable for formal situations.
Example dialogue
¡Esto no se hace!
You mustn't do that!
Perdón, no lo volveré a hacer.
Sorry, I won't do it again.