開誠布公 [开诚－－]

Jyutping hoi1 sing4 bou3 gung1
Pinyin kāi chéng bù gōng

Definitions (CC-CEDICT)
  1. lit. deal sincerely and fairly (idiom); frank and open-minded
  2. plain speaking
  3. Let's talk frankly and openly between ourselves.
  4. to put one's cards on the table
Definitions (Wiktionary)
  1. phrase, idiomatic
    to wear one's heart on one's sleeve; to be frank and sincere