noun · The liver; the anatomical organ.

他因为经常熬夜，肝脏出了点问题。

noun · (slang) to put in long hours, typically late into the night, playing a video game or working.

为了赶进度，我决定今晚肝个通宵。

noun · (slang, of a video game) involving a lot of repetition or excessive time to progress.

这游戏太肝了，我每天都要刷好几个小时。