call (your) bluff

to make someone do what they said they will do.

He said he would help, and now his opponents have called his bluff and asked him to provide the funds.

Etymology: based on the literal meaning of calling a bluff in a card game (= forcing someone to show the cards they hold)

• attribute to
• attribute to someone
• attribute to something
• a turf war
• a turkey shoot
• a turn of phrase
• a turn of the knife
• a turn of the screw
• at variance with
• at variance with someone
• at variance with something
• a twist of the knife
• at wit's end
• at worst
• a two-way street
• at your best
• at your convenience
• at your earliest convenience
• at your expense
• at your fingertips
• at your leisure
• at your mother's knee
• at your own game
• at your wit's end
• au courant