Harden

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Harden

(v. t.) To make hard or harder; to make firm or compact; to indurate; as, to harden clay or iron.
(v. t.) To accustom by labor or suffering to endure with constancy; to strengthen; to stiffen; to inure; also, to confirm in wickedness or shame; to make unimpressionable.
(v. i.) To become hard or harder; to acquire solidity, or more compactness; as, mortar hardens by drying.
(v. i.) To become confirmed or strengthened, in either a good or a bad sense.