Caseharden meaning

kāshärdn
Frequency:
To harden the surface or case of (iron or steel) by high-temperature shallow infusion of carbon followed by quenching.
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To make callous or insensitive.
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To form a hard, thin surface on (an iron alloy)
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To make callous or unfeeling.
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To harden the surface of iron or steel by infusing carbon into the surface layer.
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(by extension) To make insensitive to hardship.
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