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Meaning of 'Heart of steel'

What does the saying 'Heart of steel' mean?

Idiom: Heart of steel

Meaning:

When someone has a heart of steel, they do not show emotion or are not affected emotionally.

Country: International English | Subject Area: Body and bodily functions | Usage Type: Both or All Words Used
All idioms have been editorially reviewed. Submitted idioms may have been edited for correctness and completeness.
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