cast doubt on

Idioms & Phrases

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.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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00:10
Cast doubt on is always a great word to know.
So is ninnyhammer. Does it mean:
the offspring of a zebra and a donkey.
a fool or simpleton; ninny.
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