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Jyutping diu6 ji5 hing1 sam1
Pinyin diào yǐ qīng xīn

Definitions (CC-CEDICT)
  1. to treat sth lightly; to lower one's guard
Definitions (粵典–words.hk)
  1. 動詞
    處理​事情​嗰​時​,​抱持​住​輕​忽​嘅​心​態
    to underestimate due to arrogance
    • 你唔好因為對手太弱而掉以輕心。
      你唔好因为对手太弱而掉以轻心。
      nei5 m4 hou2 jan1 wai6 deoi3 sau2 taai3 joek6 ji4 diu6 ji5 hing1 sam1.
      I know the opponent is no match for you. But don't be over-confident and underestimate him.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to lower one's guard; to relax one's vigilance; to treat something lightly
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    你唔好因为对手太弱而掉以轻心。
    你唔好因為對手太弱而掉以輕心。
    nei5 m4 hou2 jan1 wai6 deoi3 sau2 taai3 joek6 ji4 diu6 ji5 hing1 sam1.
    • I know the opponent is no match for you. But don't be over-confident and underestimate him.