The Collaborative International Dictionary
Peccavi
Peccavi \Pec*ca"vi\ [L.]
I have sinned; -- used colloquially to express confession or
acknowledgment of an offense.
--Aubrey.
Douglas Harper's Etymology Dictionary
peccavi
1550s, Latin, literally "I have sinned;" past tense of peccare "to sin" (see peccadillo). Related: peccavimus "we have sinned;" peccavit "he has sinned."
Wiktionary
peccavi
interj. An expression of guilt or culpability. n. An act of saying ‘peccavi’; an admission of guilt or responsibility.
Usage examples of "peccavi".
Your only course is to crawl flat on your belly, roaring out Peccavi and beating your bosom.
The coulpe or peccavi, is made for a very small matter-- a broken glass, a torn veil, an involuntary delay of a few seconds at an office, a false note in church, etc.