The idiom "bad apple" finds its origin in the concept of a single spoiled or decayed apple that can affect the entire batch of apples due to its contagious nature. In a metaphorical sense, it is used to refer to an individual or element within a group that displays negative behavior, poor character, or corruption, which has the potential to influence and disrupt the entire group or organization.

英語での「 bad apple」の定義と意味

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