In steppe culture, the bond between anda is heavier than that of blood brothers.
Tips
culture
Transliteration of Mongolian ᠠᠨᠳᠠ (anda) — two men who swear brotherhood by exchanging gifts or blood. Famous from The Secret History of the Mongols: the young Temüjin (later Genghis Khan) and Jamukha swore anda three times.
usage
Almost exclusively a historical / literary term today. In modern Mandarin meaning "sworn brother", 结拜兄弟 or 拜把子 are the everyday words.