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