fai3 zeon6 sam1 si1费尽心思
Jyutpingfai3 zeon6 sam1 si1
Yalefai jeunh sām sī

Definition

to rack one's brains (idiom); to take great pains to think sth through

Tone guide

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

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