獅子大開口 [狮－－开－]

Jyutping si1 zi2 daai6 hoi1 hau2
Pinyin shī zi dà kāi kǒu

Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    to ask for an unjustly large amount of money or/and goods
  2. phrase, figuratively, idiomatic, rare
    to have a big talk; to exaggerate