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Jyutping sam1 wo1 zi2
Pinyin xīn wō zi

Definitions (Wiktionary)
  1. noun
    center of the chest; precordium
  2. noun, figuratively, poetic
    heart of hearts; heart
    (syn.) 私心, 心中, 意下, 肚裡, 心里, 胸, 心裡, 寸心, 心窝, 内心, 肚里, 心田, 肺肝, 心頭, 心上, 肚子, 心內, 心窩, 心头, 心曲, 心坎, 心地, 心内, 胸中, 心骨, 胸坎, 內心