san4 bat1 zi1 gwai2 bat1 gok3神不知鬼不觉
Jyutpingsan4 bat1 zi1 gwai2 bat1 gok3
Yalesành bāt jī gwái bāt gok

Definition

top secret

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.