比喻说出底细（多指事情的原委或拥有的实力等）to reveal all

• 对有些医院来说，难就难在不愿光明做事，不愿向患者及其家属亮底牌、交实情。

  For some hospitals, the difficulty is that they are unwilling to do things transparently, and are unwilling to give patients and their families the whole story and the truth.

• 他们近年来坚持在工资奖金分配上向职工群众亮底牌，不搞特殊，不谋私利。

  In recent years, they have insisted on revealing everything about the distribution of wages and bonuses to the workers, not giving special treatment, and not seeking personal gain.