Definition of a rotten or bad apple in English:

a rotten (or bad) apple

  • informal A bad or corrupt person in a group, especially one whose behaviour is likely to have a detrimental influence on the others: chartered accountants have no time for rotten apples in their professional barrel looks like we hired ourselves a bad apple
    [with reference to the effect that a rotten apple has on fruit with which it is in contact]
    More example sentences
    • That's all I'm saying, is we have to start blaming the barrel and not simply saying there are a few bad apples who corrupted the barrel.
    • Still, aggressive masculine behaviour isn't the problem of a few bad apples.
    • Some reports list the officers and agencies responsible by name, but they are likely never to be considered bad apples, but only the custodians of a barrel that had some defects.
See parent entry: apple

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody