To compromise one's principles and go along with corrupt or undesirable practices; to drift with the tide or go with the flow, often implying moral compromise.
他本来有自己的主见，但为了讨好同事，渐渐也开始滑泥扬波，不再坚持原则了。
He originally had his own ideas, but to please his colleagues, he gradually started to compromise his principles and go along with the tide, no longer adhering to them.
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