工於 [－于]

Jyutping gung1 jyu1
Pinyin gōng yú

Definitions (Wiktionary)
  1. noun, literary
    to be good at something; to be expert in; to be skilled in
    (syn.) 善用, 精通, 长于, 擅长, 精于, 湛深, 熟行, 精於, 见长, 長於, 善能, 善于, 擅長, 見長, 善於, 撚手
Examples (粵典–words.hk)
  1. Cantonese
    工于心计
    工於心計
    gung1 jyu1 sam1 gai3
    • good at scheming