红杏出墙 Red apricot out of the wall
Explanation
原指杏花盛开，枝条伸出墙外。后多用来比喻女子不贞，与人私通。
Originally referred to apricot blossoms blooming, branches extending beyond the wall.Later, it is mostly used to describe a woman's infidelity and having an affair with someone.
Origin Story
话说唐朝时期，有个秀才名叫李白，他年轻有为，才华横溢，深受皇帝赏识。他娶了一位贤惠美丽的妻子，名叫王昭君。婚后，二人感情甚笃，夫唱妇随，羡煞旁人。然而，随着时间的推移，李白因公事长期在外奔波，与妻子聚少离多。而王昭君在家中，日日思念丈夫，内心寂寞难耐。一日，王昭君在自家后花园赏花，无意中看到一枝红杏探出墙外，娇艳欲滴，心中顿生无限感慨。她不禁想起丈夫远在千里之外，心中百感交集。这时，她一位年轻的表哥，前来探望她。二人在花园中相谈甚欢，渐渐地，他们之间萌生了暧昧的情愫。王昭君出墙的事很快在当地传开，李白知道后，内心悲痛万分。他无法接受妻子的背叛，最终选择与王昭君和离，独自一人隐居山林。此后，李白便将这段痛苦的经历，写进了自己的诗篇中。故事中，红杏出墙不再只是简单的自然现象，而是用来比喻夫妻感情破裂，一方不忠的象征。
During the Tang Dynasty, there was a scholar named Li Bai. He was young, talented, and gifted, and was highly regarded by the emperor. He married a virtuous and beautiful woman named Wang Zhaojun. After their wedding, they were very much in love and lived a happy life. However, as time went on, Li Bai had to spend a long time abroad for his work, so he rarely saw his wife. Wang Zhaojun missed her husband every day at home and felt lonely and unhappy. One day, Wang Zhaojun was admiring the flowers in her garden when she accidentally noticed a red apricot that protruded from the wall. Its beauty moved her to tears, and she sighed as she thought of her husband far away. At that moment, her young cousin came to visit her. The two chatted lively in the garden, and gradually they developed feelings for each other. Wang Zhaojun's affair quickly became known in the neighborhood, and when Li Bai found out, he was heartbroken. He could not accept his wife's betrayal and ultimately chose to divorce her and retire to the mountains. Later, Li Bai wrote about his painful experience in his poems. In this story, the red apricot that sticks out of the wall is no longer just a simple natural phenomenon, but a symbol of the breakdown of a marriage and the infidelity of one spouse.
Usage
常用来形容女子不贞，也可用以比喻事物蓬勃发展，突破限制。
Often used to describe a woman's infidelity, it can also be used to describe the vigorous growth and overcoming of limitations.
Examples
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花园里百花盛开，一枝红杏探出墙外，格外艳丽。
huayuanli baihuashengkai,yizhi hongxing tankuangwai,gewai yanli.
The flowers in the garden are in full bloom, and a branch of red apricot stretches out over the wall, especially beautiful.
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他最近行为有些异常，恐怕是红杏出墙了。
ta zuijin xingwei youxie yichang,kongpa shi hongxing chuqiang le
His recent behavior is somewhat unusual; I'm afraid he's having an affair.