Definition of peccadillo noun from the Oxford Advanced Learner's Dictionary

 

peccadillo

 noun
noun
BrE BrE//ˌpekəˈdɪləʊ//
 
; NAmE NAmE//ˌpekəˈdɪloʊ//
 
(pl. peccadilloes, peccadillos)
 
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a small unimportant thing that somebody does wrong She forgave her husband’s sexual peccadilloes. Word Origin late 16th cent.: from Spanish pecadillo, diminutive of pecado ‘sin’, from Latin peccare ‘to sin’.
See the Oxford Advanced American Dictionary entry: peccadillo