To work together with others to achieve a common purpose
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Positive
在拔河比赛中,同学们齐心协力,终于战胜了对手 | Zài báhé bǐsài zhōng, tóngxuémen qíxīnxiélì, zhōngyú zhànshèng le duìshǒu
In the tug-of-war competition, the students all worked together and finally defeated their opponents
[Source]
当地人齐心协力打击毒品贩子 | Dāngdì rén qíxīnxiélì dǎjī dúpǐn fànzi
The local people banded together to fight the drug dealers
[Source]
None
齐心同力 (qí xīn tóng lì)
齐心并力 (qí xīn bìng lì)
This is an HSK chengyu
《墨子》(Mò Zǐ), an eponymous work by the founder of Mohism during the Warring States Period (战国时期 |Zhàn Guó Shí Qī | 475 - 221 BC)
I was unable to find a sufficient number of distinct sources, so I will not translate this story