From Longman Dictionary of Contemporary Englishthrow doubt on somethingthrow doubt on somethingto make people think that something is probably not true Fresh evidence has thrown doubt on her story. → throw
Examples from the Corpus
throw doubt on something• Wallis further throws doubt on Gusfield's claim that he had in fact identified a status group.• The market people passed comments on his wife and, he said, threw doubt on his ability to better her.• What they have to say throws doubt on previous inferences about how labour-intensive Maya agricultural techniques were, at least at San Antonio.• In the sickroom or with Diniz, Nicholas never threw doubt on the arrival of Katelina's dream fleet. 