syu1 dou3 jung6 si4 fong1 han6 siu2书到用时方恨少
Jyutpingsyu1 dou3 jung6 si4 fong1 han6 siu2
Yalesyū dou yungh sìh fōng hanh síu

Definition

to regret not having studied harder in the past and only realising now that you need to use that knowledge

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.