verb ·Rare ·Advanced level

Definitions

Verb

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

Synonyms

All synonyms

harden

Etymology

From case + harden.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.