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Jyutping saa2 zeoi2 pei4 zi2
Pinyin shuǎ zuǐ pí zi

Definitions (CC-CEDICT)
  1. to talk glibly
  2. to talk big
  3. to be all talk
Definitions (Wiktionary)
  1. verb, derogatory, verb-object
    to be a smooth talker; to be a slick talker
  2. verb, verb-object
    to be all talk and no action