Character says something he/she should not know
Is there a name for the trope where a character betrays himself/herself when they say/do something they shouldn't know? For example, somewhere in the series Homeland, Carrie offers Nicholas some tea from his favorite tea brand. This gives away to Nicholas that she has been spying on him.
Update: Some interesting options are given in the comments, however none of them exactly covers it. The desired term would cover the example I gave and the terms "I never told you my name", " I never said it was poison" as well as other similar terms/examples. The terms "Saying too much" and "Loose lips" are too broad because they not necessarily entail giving yourself involuntary away with a detail you shouldn't not know. A drunk babbling away would also be covered by these terms.
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Dramatic irony is defined as when the audience knows something that a character does not know. Verbal irony occurs when the intended meaning of something is other than what is communicated.What is it called when a character says something?
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