zi1 bei2 zi1 gei2
Jyutpingzi1 bei2 zi1 gei2
Yalejī béi jī géi

Definition

to know the enemy and know oneself (idiom, from Sunzi's "The Art of War")

Tone guide

T1High level
T2High rising
T3Mid level
T4Low falling
T5Low rising
T6Low level

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Dictionary data from CC-Canto and CC-CEDICT, licensed under CC BY-SA 3.0.