Muddy the waters:
To make a situation more confused and less easy to understand or deal with.
字面意思是“把水搅浑”，与中文一样，实际意思是 “搞乱某个状况，使事情或问题变得更复杂或不清楚”。
例句
In trying to fix the problem, Roy’s advice just muddied the waters.
本想解决问题，但罗伊的建议反倒把事情越搞越乱。
Having two managers working on the project just muddied the waters – we only need one person to take charge.
让两名经理来参与这个项目，只会越搞越乱 —— 我们只需要一个人来负责。
We need to focus on this task so please don’t bring in other issues to muddy the waters.
我们得专注做这项任务，所以请不要引入其它问题来搅乱现状。
