Definition of harden in English:

harden

Line breaks: hard¦en
Pronunciation: /ˈhɑːd(ə)n
 
/

verb

1Make or become hard or harder: [no object]: wait for the glue to harden [with object]: bricks which seem to have been hardened by firing
More example sentences
  • As the crystals form connections, the concrete stiffens, hardens, and gains strength.
  • These are essential for keeping fat and water dispersed evenly in an emulsion, and then binding the free water after freezing and hardening so ice crystal formation is negligible.
  • The glue-on patches have been just as ineffective, with most failures coming when the glue hardens and cracks and the patch peels away.
Synonyms
solidify, set, become hard, become solid, congeal, clot, coagulate, stiffen, thicken, cake, freeze, bake, crystallize;
strengthen, reinforce
technical anneal, vulcanize, ossify, petrify
1.1Make or become more severe and less sympathetic: [with object]: she hardened her heart
More example sentences
  • They'll trumpet their exemplar's views when he says too much gothic severity hardens the heart, but probably don't care to publicise such statements as this.
  • A glut of sob stories, short memories and disenchantment over aid funds will create a backlash that hardens people's hearts toward tragedy.
  • The opening line was, ‘Immigration, it seems, hardens hearts and softens brains like few other issues’.
Synonyms
toughen, desensitize, inure, make insensitive, make tough, make unfeeling, case-harden, harden someone's heart;
brutalize, make callous
rare indurate
1.2Make or become tougher and more clearly defined: [no object]: suspicion hardened into certainty [with object]: this served only to harden the resolve of the island nations
More example sentences
  • The spectacle has now hardened into tradition.
  • The country has long since hardened into its own shape, and whether it holds together or breaks into pieces is largely up to the Iraqis who now have it in their hands.
  • He wasn't terribly popular in our part of the constituency and rumours, some of which have hardened into allegations, abounded.
1.3 [no object] (Of prices of shares, commodities, etc.) rise and remain steady at a higher level: if oil prices harden at the end of this century
More example sentences
  • Trade has kept pretty steady over the past week, with lamb prices hardening in response to smaller numbers on the market.
  • Goldman Sachs believes oil prices are continuing to harden and that buying at $55 per barrel forward offers huge potential gains to investors.
  • He said ‘As the prospects of a bumper EU harvest fade rapidly due to adverse weather conditions, market prices for grain will harden.’

Phrases

hardening of the arteries

another term for arteriosclerosis.
More example sentences
  • These changes include the graying and loss of hair, cataract formation, hardening of the arteries, osteoporosis, diabetes, skin changes, and cancer.
  • The results of this type of thinking include diabetes, hypertension, hardening of the arteries, premature senility, arthritis, liver disease and a whole host of other conditions that you do not want.
  • Hypertension can cause heart failure, hardening of the arteries (and potential heart attack), kidney failure, vision changes, or stroke.

Phrasal verbs

harden something off

Inure a plant to cold by gradually increasing its exposure to it: the cuttings can be left in the frame until mid May, when they can be hardened off and planted out
More example sentences
  • Add moisture retaining granules and slow release fertiliser to the compost and gradually harden the plants off before putting them outside completely at the end of the month.
  • Not everyone has the luxury of a greenhouse, but plants can be hardened off by taking them outdoors during the day and bringing them in again in the late evening.
  • Gradually harden them off over three to five days by putting them in a protected shady spot, first for half a day, then a full day, and then gradually into full sun.

Derivatives

hardener

noun
More example sentences
  • They are made of chemo ceramic - a mixture of ceramic powder with 15 hardeners, including sodium bentonite, quartz and felspur, and burnt over 24 hours.
  • Every time you uncover a little bit of bone, you pour hardener over it to help protect it from being scratched or shattered.
  • Liquid hardeners can penetrate some slabs as much as 1/8 inch, and can increase the surface abrasion resistance by 25% or more, according to Dianne Carey, senior chemist for W.R. Meadows, Hampshire, Ill.

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