Definition of rotten apple in English:

rotten apple

Line breaks: rot¦ten apple

noun

informal
Used to refer to a morally corrupt person in a group, regarded as capable of having an adverse effect on others: chartered accountants have no time for rotten apples in their professional barrel

Definition of rotten apple in:

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Word of the day deictic
Pronunciation: ˈdeɪktɪk
adjective
denoting a word whose meaning depends on context...