call sb'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, because you do not believe them
Thesaurus: synonyms and related words
Proving and disproving
- actions speak louder than words idiom
- attest
- authenticate
- back sb up
- bear witness (to sth) idiom
- belie
- catch
- colour
- documentary
- evidence
- explode
- explosion
- give the lie to sth idiom
- proof
- stick
- testament
- the acid test
- the burden of proof idiom
- undocumented
- unsubstantiated
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