What does "Great Sage Tiger Change" mean?

Idiom: Great Sage Tiger Becomes Great Immortal hǔ.

Explanation: tiger change: such as the change of tiger body pattern. The source of metaphor is unpredictable.

Source: Book of Changes Ge: "A great man has changed, and he has no possession."

Example: ~ ignorant, quite like an ordinary person in those days. Song of Fu Liang by Tang Li Bai

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