What does it mean to spread your wings and let Xiang's two-feathered geese fly?

It means: a two-feathered goose flying freely with open wings.

The Youth Pre-service Training Dictionary explains:

Spread your wings.

② refers to the wings on both sides of the crown of the ancient official hat.

Key words:

Official hat: official hat making. As opposed to "cap"

Wings:

(1) the floorboard of the bird wings.

(2) the part of an object that is shaped or acts like a wing.

Open: separate closed things. An open umbrella.

Related idioms: spread your wings and fly high

[Idiom explanation] refers to a bird spreading its wings and flying far away. It is also a metaphor for giving full play to one's talents and ambitions.

[Source of allusions] The nineteenth chapter of Qing Wenkang's Biography of Heroes of Children: "This cry makes the iron Buddha sad, and the stone man cries; The wind is sad, the clouds are sad, and the cranes crow. Even the birds in that tree are flying high. "

[common] commonly used.

[Emotional color] A commendatory term.

[Grammatical Usage] Used as a predicate and an object; Show your ambition.

[Idiom Structure] Serialized.

[Date of birth] Modern.