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knight in shining armor

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A rescuer or defender, as in What this political party needs is a knight in shining armor to change its tarnished image. This metaphoric expression alludes to a medieval knight. [Mid-1900s]

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Fill in the blank: I can’t figure out _____ gave me this gift.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

How to use knight in shining armor in a sentence

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