Literally 'to come out of the mountains' — in Chinese tradition, sages and hermits retreat to the mountains, so 'coming out' means re-engaging with the world.
During the company crisis, the founder had to come back.
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history
The most famous 出山 in Chinese history is Zhuge Liang (诸葛亮) leaving his mountain retreat after Liu Bei visited him three times (三顾茅庐). This story made 出山 a metaphor for a talented person finally agreeing to serve.
