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Jyutping gaau2 zeon6 nou5 zap1
Pinyin jiǎo jìn nǎo zhī

Definitions (CC-CEDICT)
  1. to rack one's brains
Definitions (粵典–words.hk)
  1. 動詞
    用​盡​精力​,​費盡腦​筋​都​諗​唔​到​方法​或者​構思
    to rack one's brain; to think very hard; literally: to exhaust the juice of the brain
    • 我絞盡腦汁都諗唔到好嘅辦法。
      我绞尽脑汁都谂唔到好嘅办法。
      ngo5 gaau2 zeon6 nou5 zap1 dou1 nam2 m4 dou2 hou2 ge3 baan6 faat3.
      I racked my brain on this issue and still nothing feasible come forth.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to rack one's brain
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    他绞尽脑汁想办法搞定这件事。
    他絞盡腦汁想辦法搞定這件事。
    tā jiǎo jìn nǎo zhī xiǎng bàn fǎ gǎo dìng zhè jiàn shì 。
    • He's racking his brains about how to deal with the matter.
Examples (粵典–words.hk)
  1. Cantonese
    我绞尽脑汁都谂唔到好嘅办法。
    我絞盡腦汁都諗唔到好嘅辦法。
    ngo5 gaau2 zeon6 nou5 zap1 dou1 nam2 m4 dou2 hou2 ge3 baan6 faat3.
    • I racked my brain on this issue and still nothing feasible come forth.