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

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
References in classic literature ?
To cast doubt on the ownership of land means, in Ethiopia, the letting in of waters, and the getting out of troops.
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".
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.