verb hard·en \ˈhär-dən\
: to become hard or firm or to make (something) hard or firm
: to become more definite and strongly felt or to make (something) more definite and strongly felt
: to make (someone) hard : to make (someone) less emotional and less likely to feel sorry for other people
hard·enedhard·en·ing \ˈhärd-niŋ, ˈhär-dən-iŋ\
: to confirm in disposition, feelings, or action; especially : to make callous <hardened his heart>
a : inure, toughen <harden troops>
b : to inure to unfavorable environmental conditions (as cold) —often used with off <harden off seedlings before transplanting>
: to protect from blast, heat, or radiation (as by a thick barrier or placement underground)
: to become hard or harder
a : to become firm, stable, or settled
b : to assume an appearance of harshness or severity <her face hardened at the thought>
: to become gradually acclimatized to unfavorable conditions —often used with off <plants hardened off before the first frost>
defined for English-language learners
Examples of HARDEN
- The presence of certain substances in the blood can cause the arteries to harden.
- These additives are designed to harden the steel.
- substances that can harden the arteries
- Opposition to the goverment has hardened as news of further scandals has leaked out.
- The news has hardened opposition to the government.
- He had been hardened by his years of military service.
First Known Use of HARDEN
Sir Arthur 1865–1940 Eng. chem.
Maximilian 1861–1927 originally Felix Ernst Witkowski Ger. writer
: to make or become hard or harder <By now the cement has hardened.>
: to make or become hardy or strong <Years of tough work had hardened his muscles.>
: to make or become stubborn or unfeeling <She hardened her heart and refused to forgive him.>