self-incrimination

noun

the act of exposing oneself generally to criminal prosecution, either by interrogation or voluntarily; compelling someone to self-incriminate is outlawed in many legal systems

Wiktionary

noun

Etymology: Etymology tree Proto-Indo-European *swé? Proto-Indo-European *selbʰ-der. Proto-Germanic *selbaz Old English self Old English self- Middle English self- English self- English incrimination English self-incrimination From self- + incrimination.

Act of giving testimony, in a trial, that would incriminate oneself.