# caseharden

> English word · Verb

## Definitions
1. To harden the surface of iron or steel by infusing carbon into the surface layer.
2. To make insensitive to hardship.

## Etymology
From case + harden.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/caseharden