damage/undermine somebody’s credibility (as something)• Hume believed that four factorsundermine the credibility of reports of miracles.• The practices of the press were to further undermine its credibility.• Charity knew that to protest any more would only undermine her credibility.• This rather undermines his credibility as a detachedobserver.• The benefit to competitiveness would be short-term, while the damage to our credibility as an economy would be massive.• The number of leaks is beginning to undermine the credibility of those who claimemails can be made secure.• The Bible's miracles, so far from supporting its claim to supernaturalauthority, served rather to undermine its credibility.• But that would damage the credibility of the government further and certainly affect the financial markets, analysts said.