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Jyutping sing4 cin1 sing4 maan6
Pinyin chéng qiān chéng wàn

Definitions (CC-CEDICT)
  1. lit. by the thousands and tens of thousands (idiom); untold numbers
  2. innumerable
  3. thousands upon thousands
Definitions (Wiktionary)
  1. phrase, idiomatic
    by the thousands and tens of thousands; untold numbers; innumerable; thousands upon thousands
    (syn.) 成千上万, 成千上萬, 成千累萬, 成千累万