"相忘于江湖" (xiāng wàng yú jiāng hú) in Engpsh is "to be forgotten in the world".

It is a Chinese idiom that originated from a story about two close friends who went their separate ways and eventually lost touch with each other. The phrase is used to describe two people who were once close but have since drifted apart and lost contact.

Example sentences in Engpsh with Chinese translations:

"We were once best friends, but now we've become pke strangers, lost in the world." (我们曾经是最好的朋友，但现在我们像陌生人一样，相忘于江湖。)
"It's been years since we last saw each other, and it feels pke we've been forgotten in the world." (多年不见，好像相忘于江湖。)
"Life is unpredictable, and it's not uncommon for people to drift apart and become forgotten in the world." (生活是不可预测的，人们渐行渐远并相忘于江湖并不少见。)