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Jyutping dang2 dou3 geng2 dou1 coeng4
Pinyin děng dào jǐng dōu zhǎng

Definitions (粵典–words.hk)
  1. 語句、俚語
    等待​一段​好​長​嘅​時​間
    to have been waiting for a very long time; literally "to wait till one's neck becomes long"
    • 我今日去見工,等到我頸都長都見唔到個老細。
      我今日去见工,等到我颈都长都见唔到个老细。
      ngo5 gam1 jat6 heoi3 gin3 gung1, dang2 dou3 ngo5 geng2 dou1 coeng4 dou1 gin3 m4 dou2 go3 lou5 sai3.
      I was at a job interview today and has endured a neck-breaking wait for the interviewer.
  2. 近義詞
    望到頸都長
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    to wait for a very long time
    (syn.) 等到頸都長埋, 等到颈都长埋
Definitions (Kaifangcidian)
  1. 等得很久了
  2. 等得太久了
  3. 等得脖子都酸了

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Jyutping dang2 dou3 geng2 dou1 coeng4
Pinyin děng dào jǐng dū cháng

Definitions (CC-CANTO)
  1. a long wait (slang)
Examples (粵典–words.hk)
  1. Cantonese
    快啲开波啦,等到颈都长喇。
    快啲開波啦,等到頸都長喇。
    faai3 di1 hoi1 bo1 laa1, dang2 dou3 geng2 dou1 coeng4 laa3.
    • Come on, can we start the game already?
  2. Cantonese
    等到颈都长,政府派钱终于有声气。
    等到頸都長,政府派錢終於有聲氣。
    dang2 dou3 geng2 dou1 coeng4, zing3 fu2 paai3 cin2 zung1 jyu1 jau5 seng1 hei3.
    • We've been waiting for an eternity, but there's finally good news about the government handout.