訣別

to bid farewell / to part (usually with little hope of meeting again)

to bid farewell / tricks of the trade / pithy mnemonic formula (e.g. Mao Zedong's 16-character mantra 十六字訣|十六字诀 on guerrilla warfare)

surname Bie

to leave / to depart / to separate / to distinguish / to classify / other / another / don't ...! / to pin / to stick (sth) in / (noun suffix) category (e.g. 性別|性别[xing4 bie2], 派別|派别[pai4 bie2])