cast doubt on

cast doubt on (someone or something)

To cause someone or something to be viewed with doubt, skepticism, or uncertainty. I considered Walt for the promotion, but his constant lateness soon cast doubt on that decision. Such a significant error really cast doubt on all of the experiment's results.
See also: cast, doubt, on
Farlex Dictionary of Idioms.

cast doubt on

Cause something or someone to be questioned. For example, The prosecutor cast doubt on the wife's alibi. This idiom uses cast in the sense of "throw," a usage dating from the early 1200s.
See also: cast, doubt, on
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • call (someone or something) into question
  • call in question
  • call into question
  • bring (someone or something) into question
  • bring into question
  • bring/call/throw something into question
  • cast doubt
  • cast doubt on (someone or something)
  • consider
  • consider (someone) for (something)
References in periodicals archive
Labour leader Ed Miliband said the appointments cast doubt on Came r on's judgment at a time when he was "telling everybody to tighten their belts".
Axeman PM hires pair to boost image
At the same time, if the addition does not negate or cast doubt on the validity of the jurat, Form 1040 may be treated as a valid return.
Form 1040 with all zeroes is not a valid return. (Procedures & Administration)