https://en.wiktionary.org/wiki/%E1%A0%A8%E1%A1%B3%E1%A1%B4%E1%A0%A0%E1%A0%A8#Manchu

Related to native Manchu verbs such as ᠨᡳᡴᡝᠮᠪᡳ ‎(nikembi, “to lean on, to rely on”‎) and ᠨᡳᡴᡝᠪᡠᠮᠪᡳ ‎(nikebumbi, “to prop up, to support”‎) with the original meaning of “servant”, the meaning of which transferred to “Han Chinese” upon Jurchen/Manchu expansion, during which the conquered Han became subservient to the Manchus. Alexander Vovin considers this sort of semantic shift from a derogatory Proto-Tungusic root most likely, citing Negidal [script needed] ‎(nikan, “Chinese, bandit, robber”‎), Udihe [script needed] ‎(ningka, “Chinese, laborer, worker”‎), Oroch [script needed] ‎(n’ingka, “slave, servant”‎), and other Tungusic forms, and says:
　”Regardless of the phonetic details, the semantic fit seems to be almost perfect: ‘robber, slave, servant’—what could be more offensive to an enemy?”

迫真是 N-word