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Jyutping cung1 saang1 saai3
Pinyin chōng shēng shài

Definitions (CC-CANTO)
  1. to pose as a big shot; to put on a front; to pretend to be 'in the know' [colloquial – dated, not in use so commonly nowadays]
Definitions (粵典–words.hk)
  1. x