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Bosom Buddy 

‘Bosom buddy’ called zhi yin in Chinese, refers to the friend who knows you best. The ancient story of Boya and Ziqi describes how Chinese define zhi yin.Long, long ago, Boya, who was a master of guqin, a Chinese musical instrument met Ziqi, who was collecting firewood down a mountain.

While Boya was playing guqin, Ziqi said “I can hear the mountain singing and the water flowing in your music”.Ziqin was only a lumberjack but he could tell what Boya wanted to express.When Ziqi died, Boya played his guqin for the last time in front of Ziqi’s tomb.

Afterwards, people used the quote about ‘high mountains and flowing water’ to describe friends who understand and appreciate each other.If someone in China says that you are his or her ‘zhi yin’, it means you are his or her best friend.