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steel one's heart against

Idioms  

  1. Also, harden one's heart. Suppress one's feelings for, as in He finally steeled his heart against them and refused the loan, or You'll just have to harden your heart and tell them the truth. This metaphoric idiom transfers making something hard to rendering oneself insensible or unfeeling. Versions of it date from the late 1500s. Also see heart of stone.

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.