become hard or harder; The wax hardened

[ Syn: indurate ]

make hard or harder; The cold hardened the butter

[ Syn: indurate ]

harden by reheating and cooling in oil; temper steel

[ Syn: temper ]

make fit; This trip will season even the hardiest traveller

[ Syn: season ]

cause to accept or become hardened to; habituate; He was inured to the cold

[ Syn: inure , indurate ]