A sudden crisis, trouble, or betrayal that arises from within one's immediate circle or close associates; an internal upheaval.
公司核心团队的几位成员突然辞职，对项目造成了严重的冲击，真是一场肘腋之变。
The sudden resignation of several core team members caused a severe impact on the project; it was truly a crisis from within their immediate circle.
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