harden

v. make hard or tough; become hard or tough; strengthen, forge; be forged

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Verb
1. become hard or harder; "The wax hardened"
(synonym) indurate
(antonym) soften
(hypernym) change
(hyponym) encrust, incrust
(verb-group) indurate
(derivation) hardening, solidifying, solidification, set, curing
2. make hard or harder; "The cold hardened the butter"
(synonym) indurate
(antonym) soften
(hypernym) change
(hyponym) face-harden
(cause) indurate
(verb-group) indurate
(derivation) hardening
3. harden by reheating and cooling in oil; "temper steel"
(synonym) temper
(hypernym) modify
4. make fit; "This trip will season even the hardiest traveller"
(synonym) season
(hypernym) toughen
5. cause to accept or become hardened to; habituate; "He was inured to the cold"
(synonym) inure, indurate
(hypernym) habituate, accustom
(hyponym) callous, cauterize, cauterise

v. harden, become hard or tough; toughen, temper

v. ztvrdnout; přitvrdit