mea culpa
exclamation/ˌmeɪə ˈkʊlpə/
/ˌmeɪə ˈkʊlpə/
(from Latin, often humorous)- used when you are admitting that something is your faultWord OriginLatin, ‘by my fault’.
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mea culpa
Definition of mea culpa exclamation from the Oxford Advanced Learner's Dictionary