harden

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verb hard·en \ˈhär-dən\

Definition of harden

hardened

hardening

play \ˈhärd-niŋ, ˈhär-dən-iŋ\
  1. transitive verb
  2. 1 :  to make hard or harder

  3. 2 :  to confirm in disposition, feelings, or action; especially :  to make callous <hardened his heart>

  4. 3 a :  inure, toughen <harden troops> b :  to inure to unfavorable environmental conditions (as cold) —often used with off <harden off seedlings before transplanting>

  5. 4 :  to protect from blast, heat, or radiation (as by a thick barrier or placement underground)

  6. intransitive verb
  7. 1 :  to become hard or harder

  8. 2 a :  to become firm, stable, or settled b :  to assume an appearance of harshness or severity <her face hardened at the thought>

  9. 3 :  to become gradually acclimatized to unfavorable conditions —often used with off <plants hardened off before the first frost>

Examples of harden in a sentence

  1. The presence of certain substances in the blood can cause the arteries to harden.

  2. These additives are designed to harden the steel.

  3. substances that can harden the arteries

  4. The news has hardened opposition to the government.

  5. He had been hardened by his years of military service.

13th Century

First Known Use of harden

13th century


Harden

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biographical name Har·den \ˈhär-dən\

Definition of Harden

  1. Sir Arthur 1865–1940 Eng. chem.


Harden

biographical name hard·en

Definition of Harden

  1. Maximilian 1861–1927 originally Felix Ernst Witkowski Ger. writer



HARDEN Defined for English Language Learners

harden

play
verb hard·en \ˈhär-dən\

Definition of harden for English Language Learners

  • : 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


HARDEN Defined for Kids

harden

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verb hard·en \ˈhär-dən\

Definition of harden for Students

hardened

hardening

  1. 1 :  to make or become hard or harder <By now the cement has hardened.>

  2. 2 :  to make or become hardy or strong <Years of tough work had hardened his muscles.>

  3. 3 :  to make or become stubborn or unfeeling <She hardened her heart and refused to forgive him.>



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