E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Peccavi.
To cry peccavi. To acknowledge oneself in the wrong. It is said that Sir Charles Napier, after the battle of Hyderabad, in 1843, used this word as a pun upon his victoryPeccvi (I have sinned, i.e. Sinde).