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Jyutping wat1 mei5 sap6
Pinyin qū wěi shí

Definitions (CC-CANTO)
  1. (phrase / adverb / verb) to change one's mind just like that; an instant change of mind; a sudden / quick turnaround in the opposite direction; to do a U-turn
Definitions (粵典–words.hk)
  1. 名詞
    一瞬​間​令人​措手不及​、​意想不到​嘅​轉​折​或者​改變​;​通常​前面​會配​數量​詞組​「​一個​」
    abrupt contrast or change like a U-turn; to turn round and go back; to turn round and come back; usually preceded by the numeral-quantifier phrase 一個 jat1go3
    • 賢仔同佢細佬啱啱先鬧完交嚟,一個屈尾十兩兄弟又一齊玩返。
      贤仔同佢细佬啱啱先闹完交嚟,一个屈尾十两兄弟又一齐玩返。
      jin4 zai2 tung4 keoi5 sai3 lou2 ngaam1 ngaam1 sin1 naau6 jyun4 gaau1 lai4, jat1 go3 wat1 mei5 sap6 loeng5 hing1 dai6 jau6 jat1 cai4 waan2 faan1.
      Little Yin quarreled with his younger brother a while ago, but very then the two brothers played together.
Definitions (Wiktionary)
  1. verb, Cantonese
    to turn around and come back quickly
  2. verb, Cantonese
    to change one's mind quickly
Definitions (Kaifangcidian)
  1. 掉頭 – 掉头
Examples (粵典–words.hk)
  1. Cantonese
    贤仔同佢细佬啱啱先闹完交嚟,一个屈尾十两兄弟又一齐玩返。
    賢仔同佢細佬啱啱先鬧完交嚟,一個屈尾十兩兄弟又一齊玩返。
    jin4 zai2 tung4 keoi5 sai3 lou2 ngaam1 ngaam1 sin1 naau6 jyun4 gaau1 lai4, jat1 go3 wat1 mei5 sap6 loeng5 hing1 dai6 jau6 jat1 cai4 waan2 faan1.
    • Little Yin quarreled with his younger brother a while ago, but very then the two brothers played together.