渔翁之利 fisherman's gain
Explanation
比喻第三者从别人互相争斗中取得好处。
Refers to the advantage a third party gains from the conflict between two others.
Origin Story
战国时期，有个渔夫在河边钓鱼，看到两只水鸟在争夺一条鱼，它们你争我抢，互不相让，打得不可开交。渔夫静静地坐在一边观望着，待它们精疲力尽之时，渔夫从容地收起鱼竿，把那条鱼和两只水鸟一起装进了自己的鱼篓。
During the Warring States period, a fisherman was fishing by the river. He saw two water birds fighting over a fish. They were vying with each other, refusing to yield, fighting fiercely. The fisherman quietly sat on the side watching. When they were exhausted, the fisherman calmly put away his fishing rod and put the fish and the two water birds into his fish basket.
Usage
用作宾语；指意外的收获。
Used as an object; refers to unexpected gains.
Examples
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这次合作，我们最终渔翁得利，取得了意想不到的成功。
zhè cì hézuò, wǒmen zuìzhōng yúwēng délì, qǔdéle yì xiǎngbùdào de chénggōng.
In this cooperation, we finally benefited and achieved unexpected success.
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鹬蚌相争，渔翁得利，这可是千古不变的道理啊！
yù bàng xiāng zhēng, yúwēng délì, zhè kěshì qiānguǐ bùbiàn de dàolǐ a！
The battle between the egret and the mussel, the fisherman profits from it - that's an ancient, unchanging truth!