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call (one's) bluff
1. To challenge someone to act on their threat or prove that their claim or boast is true, when one believes they are making a false claim or idle threat (i.e. bluffing). He insisted that he could run faster than me, but when I called his bluff, he suddenly said he had to go home.
2. To disprove a bluff. Whereas the first usage simply indicates a challenge, this usage indicates that the challenge resulted in the disproval. I don't know why he keeps making these outrageous claims. I've been calling his bluff for years and making him look like a fool.
call someone's bluff
to demand that someone prove a claim or is not being deceptive. All right, I'll call your bluff. Show me you can do it! Tom said, "You've made me really angry, and I'll punch you if you come any closer!" "Go ahead," said Bill, calling his bluff.
call (someone's) bluff
To demand proof for or respond in a challenging way to the claims or threats of another that one presumes to be false.