peccavi
An act of saying ‘peccavi’; an admission of guilt or responsibility.
He heard the little man's rapid exhausted breathing as he began with the opening flourish of his peccavi, ‘Father, I have sinned.’
Where it comes from
Borrowed from Latin peccāvī (“I have sinned”).
Adapted from the Wiktionary entry peccavi (CC BY-SA 4.0).