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“滥竽充数”，汉语成语，意思是不会吹竽的人混在会吹竽的队伍里充数（pretend to play the Yu [a wind instrument] in order to make up the number for an orchestra）。比喻无本领的冒充有本领，次货冒充好货（to be there just to make up the number [used of incompetent people or inferior goods]）。
例句：
我不会唱歌， 我在这儿只是滥竽充数。I am not good at singing. I'm here just to make up the number.
宁可虚位以待，也不要让不称职的人滥竽充数。
We'd rather leave the place vacant than have someone incompetent fill the position
