cast doubt on

US /kæst daʊt ɑːn/
UK /kæst daʊt ɑːn/
"cast doubt on" picture
1.

質疑, 使人懷疑

to suggest that something may not be true, reliable, or valid

:
The new evidence cast doubt on the witness's testimony.
新證據證人的證詞提出質疑
His inconsistent statements cast doubt on his credibility.
他前後矛盾的陳述使他的可信度受到質疑