to be on the up and up 開誠佈公
英文釋義
To be honest, worthy of trust, and free of any concealed or deceitful intentions.
例句
The unfriendly sales representative I spoke with yesterday seemed hurried and distracted, so I'm not so sure he was on the up and up.
這位昨天與我交談的不友好的銷售代表看上去慌慌張張,注意力不集中,所以我不太肯定他是否在講實話。