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Jyutping hou2 zing2 ji5 haa6
Pinyin hào zhěng yǐ xiá

Definitions (CC-CEDICT)
  1. to be calm and unruffled in the midst of chaos or at a busy time (idiom)
Definitions (Wiktionary)
  1. phrase, idiomatic
    remain calm and composed while handling pressing affairs; take things easy