culprit

culprit
noun
  1. a person who is responsible for a crime or other misdeed
    罪犯,犯人;导致过错的人
    ■the cause of a problem or defect
    导致问题的原因;产生不良后果的事物
    low-level ozone pollution is the real culprit.
    低层臭氧污染是真正的根源。
语源
  1. late 17th cent. (originally in the formula Culprit, how will you be tried?, said by the Clerk of the Crown to a prisoner pleading not guilty): perhaps from a misinterpretation of the written abbreviation cul. prist, for Anglo-Norman French Culpable: prest d'averrer notre bille ('You are) guilty: (We are) ready to prove our indictment'; in later use influenced by Latin culpa 'fault, blame'
英语宝典
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