下工夫 [－－－]

Jyutping haa6 gung1 fu1
Pinyin xià gōng fu

Definitions (CC-CEDICT)
  1. to put in time and energy
  2. to concentrate one's efforts
Definitions (Wiktionary)
  1. verb, verb-object
    to put in time and energy
    (syn.) 落工夫
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）