break ranks
also break rank 1
: to step out of a line打乱队形 2
: to no longer agree with or support a person or group拆伙；分道扬镳；散伙 —
often + with -
The senator decided to break ranks with others in his party and support the proposal.这位参议员决定与党内其他成员分道扬镳，支持这一提议。
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One scientist has broken ranks with her colleagues and questioned the research.一位科学家与同事们意见相左，她对这项研究工作提出了质疑。