fu2 sam1 gu1 ngai6苦心孤诣
Jyutpingfu2 sam1 gu1 ngai6
Yalefú sām gū ngaih

Definition

to make painstaking efforts (idiom); after much trouble

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.