Chinese

		peach garden	three; 3	to make a solemn pact
trad. (桃園三結義)		桃園	三	結義
simp. (桃园三结义)		桃园	三	结义
Literally: “Oath of the Three at the Peach Garden”.

Idiom

桃園三結義

1. to become sworn brothers
2. to join forces
   • 備戰2008年北京奧運會，中日韓棒球隊“桃園三結義” [MSC, trad.]
     备战2008年北京奥运会，中日韩棒球队“桃园三结义” [MSC, simp.]
     From: 2005: anon., CHINA.com.cn

     Bèizhàn 2008 nián běijīng àoyùnhuì, zhōng rì hán bàngqiú duì "táoyuán sān jiéyì" [Pinyin]

     The baseball teams of China, Japan and Korea join forces in preparation for the 2008 Olymipics in Beijing

Synonyms

• 桃園結義／桃园结义 (táoyuán-jiéyì)

References

• Oath of the Peach Garden on Wikipedia.Wikipedia