Dictionary.com
Thesaurus.com

knight in shining armor

Idioms  

  1. 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]

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.