Verb harden has 5 senses
  1. harden, indurate - become hard or harder; "The wax hardened"
    --1 is one way to change
    Antonyms: soften
    Derived form: noun hardening2
    Sample sentences:
    Something ----s
    Somebody ----s
  2. harden, indurate - make hard or harder; "The cold hardened the butter"
    --2 is one way to change
    Antonyms: soften
    Derived form: noun hardening3
    Sample sentences:
    Somebody ----s something
    Something ----s somebody
    Something ----s something
  3. temper, harden - harden by reheating and cooling in oil; "temper steel"
    --3 is one way to modify
    Sample sentence:
    Somebody ----s something
  4. season, harden - make fit; "This trip will season even the hardiest traveller"
    --4 is one way to toughen
    Sample sentence:
    Something ----s somebody
  5. inure, harden, indurate - cause to accept or become hardened to; habituate; "He was inured to the cold"
    --5 is one way to habituate, accustom
    Sample sentences:
    Somebody ----s somebody
    Somebody ----s somebody PP
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