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Jyutping taam4 siu3 zi6 joek6
Pinyin tán xiào zì ruò

Definitions (CC-CEDICT)
  1. to talk and laugh as though nothing had happened
  2. to remain cheerful (despite a crisis)
Definitions (Wiktionary)
  1. phrase, idiomatic
    to go on talking and laughing as if nothing had happened