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Jyutping tin1 soeng6 diu6 haam2 beng2
Pinyin tiān shàng diào xiàn bǐng

Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    to have something fall into one's lap

天上掉餡餅 [---馅饼]

Jyutping
Pinyin tiān shàng diào xiàn bǐng

Definitions (CC-CEDICT)
  1. a meat pie falls from the sky (idiom)
  2. to have something fall into your lap