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Verb: harden  haa(r)-d(u)n
  1. Become hard or harder
    "The wax hardened";
    - indurate
     
  2. Make hard or harder
    "The cold hardened the butter";
    - indurate
     
  3. Harden by reheating and cooling in oil
    "harden steel";
    - temper
     
  4. Make fit
    "This trip will harden even the hardiest traveller";
    - season
     
  5. Cause to accept or become hardened to; habituate
    "He was hardened to the cold";
    - inure, indurate, enure

Derived forms: hardened, hardening, hardens

Type of: accustom, change, habituate, modify, toughen

Antonym: soften

Encyclopedia: Harden, Walsall