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Jyutping fai3 seon4 sit3
Pinyin fèi chún shé

Definitions (粵典–words.hk)
  1. 動詞
    講​好多​嘢​去​説​服​人
    to spend a lot of effort in attempt to convince someone
    • 我哋費盡唇舌,都係想管理層收返呢個決定。
      我哋费尽唇舌,都系想管理层收返呢个决定。
      ngo5 dei6 fai3 zeon6 seon4 sit3, dou1 hai6 soeng2 gun2 lei5 cang4 sau1 faan1 ni1 go3 kyut3 ding6.
      We spend a lot of effort in order to convince the management to withdraw this decision.
  2. 參看
    費盡唇舌

費唇舌 [费--]

Jyutping
Pinyin fèi chún shé

Definitions (CC-CEDICT)
  1. to argue needlessly
  2. to waste time explaining