to tell somebody to do what they are threatening to do, because you believe that they will not be cruel or brave enough to do it要求…摊牌，要求…兑现其恫吓（因相信对方不至于或不敢这样做）
She was tempted to call his bluff, hardly able to believe he’d carry out his threat.她很想逼他亮出底牌，并不相信他会做他威胁要做的事。