In flagrante delicto
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In flagrante delicto or sometimes simply in flagrante (Latin: "while the crime is blazing") is a legal term used to indicate that a criminal has been caught in the act of committing an offense (compare corpus delicti). The colloquial "caught red-handed" or "caught in the act" are English equivalents.
The Latin term has come to be used far more often as a euphemism for a couple being caught in the act of sexual congress; in modern usage the intercourse need not be adulterous or illicit.