intj. (colloquial).An acknowledgment of offence, mistake, or defeat. TO CRY PECCAVI = to confess to wrong-doing or failure. [Latin = I have sinned.]GROSE (1785).
1578. WHETSTONE, Promos and Cassandra, 32.
1611. BEAUMONT and FLETCHER, The Knight of the Burning Pestle, iv. 1. Make him sing PECCAVI, ere I leave him.