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Jyutping mou4 sam1 caap3 lau5
Pinyin wú xīn chā liǔ

Definitions (粵典–words.hk)
  1. 動詞
    無意間​做​咗​某​啲​嘢​,​而產生​意料之外​嘅​結​果​;​源​於​「​無心​插​柳柳​成蔭​」
    to have unexpected results which one did not intend for; originated from 無心插柳柳成蔭mou4sam1 caap3lau5 lau5 sing4jam3
    • 當時只不過係無心插柳,估唔到好評如潮。
      当时只不过系无心插柳,估唔到好评如潮。
      dong1 si4 zi2 bat1 gwo3 hai6 mou4 sam1 caap3 lau5, gu2 m4 dou3 hou2 ping4 jyu4 ciu4.
      It was just an accident, but it gained a sea of compliments.

無心插柳 [无---]

Jyutping
Pinyin wú xīn chā liǔ

Definitions (CC-CEDICT)
  1. (idiom) (of a good outcome) unanticipated
  2. serendipitous
  3. fortuitous
Examples (粵典–words.hk)
  1. Cantonese
    有心栽花花不香,无心插柳柳成荫。
    有心栽花花不香,無心插柳柳成蔭。
    jau2 sam1 zoi1 faa1 faa1 bat1 hoeng1, mou4 sam1 cap3 lau5 lau5 sing4 jam3
    • Flowers carefully planted did not bloom fragrant; the willow branch carelessly buried grew to become a shade.
  2. Cantonese
    当时只不过系无心插柳,估唔到好评如潮。
    當時只不過係無心插柳,估唔到好評如潮。
    dong1 si4 zi2 bat1 gwo3 hai6 mou4 sam1 caap3 lau5, gu2 m4 dou3 hou2 ping4 jyu4 ciu4.
    • It was just an accident, but it gained a sea of compliments.