call someone's bluff
US /kɔl ˈsʌm.wʌnz blʌf/
UK /kɔl ˈsʌm.wʌnz blʌf/

1.
jemandes Bluff entlarven, jemanden herausfordern
to challenge someone to prove that what they are saying is true, or to show that they are not afraid to do something that they have threatened to do
:
•
She threatened to quit, but I decided to call her bluff and see if she would actually do it.
Sie drohte zu kündigen, aber ich beschloss, ihren Bluff zu entlarven und zu sehen, ob sie es wirklich tun würde.
•
The politician made a bold claim, and the journalists decided to call his bluff by demanding evidence.
Der Politiker stellte eine kühne Behauptung auf, und die Journalisten beschlossen, seinen Bluff zu entlarven, indem sie Beweise forderten.