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During the Western Han Dynasty, after Liu Bang became emperor, he established Liu Ying, son of Empress Lü, as the crown prince. However, because he favored Consort Qi, he wanted to replace Liu Ying with Liu Ruyi.
Empress Lü sought advice from Zhang Liang, who suggested that Crown Prince Liu Ying invite the Four Sages of Mount Shang.
When Liu Bang saw that the Crown Prince had the Four Sages assisting him, his 'wings and feathers were fully grown' (羽翼已成), meaning his power base was consolidated, he then abandoned the idea of replacing the crown prince.

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Open the tool →羽翼已成 (yǔ yì yǐ chéng) is a Chinese idiom (chengyu) meaning “to have fully developed one's strength, influence, or support, making one's position secure and powerful; to be fully fledged”.
羽翼已成 is pronounced yǔ yì yǐ chéng in Mandarin Chinese.
Literally, 羽翼已成 means “Wings and feathers are fully grown”. It is used to mean “to have fully developed one's strength, influence, or support, making one's position secure and powerful; to be fully fledged”.
羽翼已成 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
鸟的羽毛和翅膀已长全。比喻力量已经巩固。