cast doubt on sth

/kˈast dˈaʊt ˌɒn ˌɛstˌiːˈeɪtʃ/

/kˈæst dˈaʊt ˌɑːn ˌɛstˌiːˈeɪtʃ/

to cast doubt on sth

to do or say something that makes others become uncertain about something they previously believed or trusted

Examples

1. Maths error casts doubts on Greater Cambridge Partnership's road.

2. A new study is casting doubt on the once popular narrative that N95 masks are more effective than surgical masks.

3. She had strong words for President Trump when he cast doubt on the death toll of Hurricane Maria in Puerto Rico.

4. Research since then has cast doubt on the claim that unintended acceleration was caused by equipment problems in the cars.