call (someone's) bluff

to make someone prove that what they are saying is true, or to make someone prove that they will really do what they say they will do, because you do not believe them.

Alice called his bluff and dared him to tell everyone what he knew about her.

• if the worst comes to the worst
• If thinks something, they've got another thing coming!
• If thinks something, they've got another think coming!
• If thinks, they've got another thing coming!
• If thinks, they've got another think coming!
• if worst comes to worst
• If you believe that, you'll believe anything!
• if you can help it
• If you can't beat 'em!
• If you can't beat 'em, join 'em!
• If you can't stand the heat, get out of the kitchen.
• if you catch my drift
• if you get my drift
• If you pay peanuts, you get monkeys.
• if you play cards right
• if you play your cards right
• If you've got it, flaunt it!
• Ignorance is bliss.
• I guess so
• I have to hand it to
• I have to hand it to someone
• ill at ease
• I'll be a monkey's uncle!
• I'll be damned
• I'll be damned if I