Harden - Definition

v 1: become hard or harder; "The wax hardened" [syn: harden,
indurate] [ant: soften]
2: make hard or harder; "The cold hardened the butter" [syn:
harden, indurate] [ant: soften]
3: harden by reheating and cooling in oil; "temper steel" [syn:
temper, harden]
4: make fit; "This trip will season even the hardiest traveller"
[syn: season, harden]
5: cause to accept or become hardened to; habituate; "He was
inured to the cold" [syn: inure, harden, indurate]