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Pronunciation varies by accent · verb
To harden the surface of iron or steel by infusing carbon into the surface layer..
Use case harden when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Case harden means To harden the surface of iron or steel by infusing carbon into the surface layer..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use case harden where its definition matches the intended context.
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