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Jyutping taam3 pun2
Pinyin tàn pán

Definitions (CC-CANTO)
  1. to sound out; to probe (e.g. in a business deal)
Definitions (粵典–words.hk)
  1. 動詞
    試探
    to test the waters, to make preliminary inquiries before starting an action
Definitions (Kaifangcidian)
  1. 摸底
  2. 試探 – 试探