cast doubt on
US /kæst daʊt ɑːn/
UK /kæst daʊt ɑːn/

1.
质疑, 使人怀疑
to suggest that something may not be true, reliable, or valid
:
•
The new evidence cast doubt on the witness's testimony.
新证据对证人的证词提出质疑。
•
His inconsistent statements cast doubt on his credibility.
他前后矛盾的陈述使他的可信度受到质疑。