May I know what 而衰三而竭 means in the following sentences?
请用英语或者日语解释，谢谢。

＞澳洲国立大学政治学者宋文笛对BBC中文分析指，从这次选举看到“抗中保台”牌已出现边际效应递减。“民进党已经运用抗中保台牌赢得2014至2016两场（‘太阳花运动’之后的）选举，以及2020总统大选，在缺乏更多重大外部事件刺激的情形下， 这张牌再而衰三而竭。”

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@thirose0726 It is“再而衰三而竭”,a ellipsis of a Chinese proverb“一鼓作气，再而衰，三而竭”,which said in《左传-曹刿论战》I strongly recommend you to read this work to have a better understanding
In ancient China,when a battle took place,on each side there was a drummer drumming to cheer the soldiers of his side up,曹刿 knows,soldiers' wills to fight would be the strongest in the very first drumming,then began to fade in the second.When it came to the third one,wills would be completely lost.
This natural law can be applied to any other lines,here it suggests the people in taiwan cease to consume this slogan Because it's used too frequently