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Jyutping laa2 sau2 m4 sing4 sai3
Pinyin lá shǒu wú chéng shì

Definitions (粵典–words.hk)
  1. 語句
    未有​準備​而​顯得​狼狽
    to be unprepared, to be not in a good position to do something; literally: to grab hands but not achieve a position
    • 忽然間落大雨,搞到我揦手唔成勢。
      忽然间落大雨,搞到我揦手唔成势。
      fat1 jin4 gaan1 lok6 daai6 jyu5, gaau2 dou3 ngo5 laa2 sau2 m4 sing4 sai3.
      It suddenly rains, makes me so unprepared to handle.
Definitions (Wiktionary)
  1. phrase, Cantonese, idiomatic
    unable to cope with or deal with a task or problem, especially due to lack of preparation
Definitions (Kaifangcidian)
  1. 棘手
  2. 手忙腳亂 – 手忙脚乱

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Jyutping laa2 sau2 m4 sing4 sai3
Pinyin lá shǒu n2 chéng shì

Definitions (CC-CANTO)
  1. in a dilemma; to be all over the place (spoken)
Examples (粵典–words.hk)
  1. Cantonese
    揦手唔成势
    揦手唔成勢
    • to be unprepared, to be not in a good position to do something
    • awkward in handling things
  2. Cantonese
    忽然间落大雨,搞到我揦手唔成势。
    忽然間落大雨,搞到我揦手唔成勢。
    fat1 jin4 gaan1 lok6 daai6 jyu5, gaau2 dou3 ngo5 laa2 sau2 m4 sing4 sai3.
    • It suddenly rains, makes me so unprepared to handle.