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

1.
mencabar gertakan seseorang, menguji seseorang
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.
Dia mengancam untuk berhenti, tetapi saya memutuskan untuk mencabar gertakannya dan melihat sama ada dia benar-benar akan melakukannya.
•
The politician made a bold claim, and the journalists decided to call his bluff by demanding evidence.
Ahli politik itu membuat dakwaan berani, dan wartawan memutuskan untuk mencabar gertakannya dengan menuntut bukti.