
It isn’t on
Colloquial Nuance
Used in a casual conversation, often to express that something is unjust or unethical.

He took credit for your idea? That isn't on!
Mild Disapproval
Expresses a light form of disapproval, not severe but clear enough to voice dissatisfaction.

She skipped the queue - it just isn't on.
British Phrase
Especially common in British English and might not be well understood elsewhere.

Bullying in the workplace? I tell you, it isn't on.
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