Call (one's) bluff phrase
To make someone use facts, evidence, etc. to show that what they say is true or that they will do what they are threatening to do because you think their claim is false or they are just making empty threats.
He boasted that he could beat me in chess. However, when I called his bluff, he suddenly said he wanted to go the toilet and disappeared.
John said "I can jump higher than 2 meters!" "Come on, show me you can do it,bro" said Jack, calling his bluff.
The verb "call" must be conjugated according to its tense.
The term comes from poker, where the players bet as to who has the best poker hand of them all. "To bluff" is to bet on a hand one does not believe is the best; "to call" means to match a bet, that is, bet an equivalent amount. When the cards are uncovered, whoever has the best hand wins the entire pot (all the money the players have put up). The term is American in origin and dates, like American poker, from the early 1800s.
Used to refer to a person who is your enemy
He faced his sworn enemy.