call (someone's) bluff

Translations
поймать (кого-то) на блефе
He called his bluff during the negotiation.
Он поймал его на блефе во время переговоров.
Definitions
To challenge someone to prove their claims or intentions, especially when it is suspected that they are not being truthful or are exaggerating.
Words
bluff

noun
блеф
call

verb
звать