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Jyutping coi3 cing1
Pinyin cài qīng

Definitions (Wiktionary)
  1. noun, Hakka
    vegetable seedling (grown in concentration)
    (syn.) 菜苗, 菜栽, 菜秧, 菜秧仔, 菜仔
  2. noun
    dark greyish green