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3. cast doubt on

cast doubt on

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cast doubt on something

to cause uncertainty about something New DNA evidence has cast doubt on the guilty verdict.

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