Etymology
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harden (n.)

c. 1200, transitive, "make (something) hard," from hard (adj.) + -en (1). Intransitive meaning "to become hard" is late 14c. The earlier verb was simply hard, from Old English heardian. Related: Hardened; hardening.

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Definitions of harden

harden (v.)
become hard or harder;
The wax hardened
Synonyms: indurate
harden (v.)
make hard or harder;
The cold hardened the butter
Synonyms: indurate
harden (v.)
harden by reheating and cooling in oil;
Synonyms: temper
harden (v.)
make fit;
Synonyms: season
harden (v.)
cause to accept or become hardened to; habituate;
Synonyms: inure / indurate
From wordnet.princeton.edu