ㄎㄞkāiㄔㄥˊchéngㄅㄨˋㄍㄨㄥgōng

  1. 三國志·三五··諸葛亮》:諸葛亮相國百姓儀軌官職從權誠心公道。」比喻誠意待人坦白無私·文天祥上皇〉:宰相開誠布公歲月調遣。」推誠布公」。坦懷相待推心置腹肝膽相照開心見誠鉤心鬥角爾虞我詐

lit. deal sincerely and fairly (idiom)​; frank and open-minded, plain speaking, Let's talk frankly and openly between ourselves., to put one's cards on the table
offen (Adj)​, offenherzig (Adj)​