比翼齐飞 fly side by side
Explanation
比翼：翅膀挨着翅膀。齐飞：成双的并飞。比喻夫妻情投意合，在事业上并肩前进。
Together with wings: wings touching wings. Flying together: a pair of flying together. It is a metaphor for a couple who are in harmony and work together to make progress in their careers.
Origin Story
很久以前，在一片美丽的森林里，住着一对名叫比翼和齐飞的小鸟。它们的羽毛颜色鲜艳，歌声动听，更重要的是，它们相爱至深。比翼和齐飞从小一起长大，它们一起玩耍，一起觅食，从不分开。它们经常一起在树林间飞翔，它们的翅膀总是挨着翅膀，就像连在一起一样，所以人们称它们为‘比翼齐飞’。有一天，一只凶猛的鹰盯上了比翼，想要把它抓走。齐飞看到后，毫不犹豫地冲上前去，用自己的身体保护比翼。最终，比翼和齐飞战胜了鹰，它们的故事也传遍了整个森林。从此以后，‘比翼齐飞’就成为了爱情的象征，用来形容夫妻恩爱，同心同德。
A long time ago, in a beautiful forest, lived a pair of small birds named Biyi and Qifei. Their feathers were brightly colored, their singing was beautiful, and most importantly, they loved each other deeply. Biyi and Qifei grew up together, they played together, they foraged together, and they never separated. They often flew together in the woods, their wings always touching each other, as if they were connected, so people called them 'Biyi Qifei'. One day, a ferocious eagle set its sights on Biyi and wanted to take him away. When Qifei saw this, he rushed forward without hesitation and protected Biyi with his own body. Finally, Biyi and Qifei defeated the eagle, and their story spread throughout the forest. From then on, 'Biyi Qifei' became a symbol of love, used to describe the love and harmony between husband and wife.
Usage
多用于形容夫妻或情侣之间感情深厚，相互扶持，共同进步。
Mostly used to describe the deep affection, mutual support, and common progress between couples or lovers.
Examples
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这对夫妻比翼齐飞，共同奋斗，最终事业有成。
zhè duì fūqī bǐ yì qí fēi, gòngtóng fèndòu, zuìzhōng shìyè yǒuchéng
This couple flew side by side, worked together, and finally achieved success in their careers.
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他们比翼齐飞，共同创造了美好的生活。
tāmen bǐ yì qí fēi, gòngtóng chuàngzào le měihǎo de shēnghuó
They flew side by side, creating a beautiful life together.