[ UK /hˈɑːdən/ ]
[ US /ˈhɑɹdən/ ]
  1. make hard or harder
    The cold hardened the butter
  2. harden by reheating and cooling in oil
    temper steel
  3. make fit
    This trip will season even the hardiest traveller
  4. cause to accept or become hardened to; habituate
    He was inured to the cold
  5. become hard or harder
    The wax hardened
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How To Use harden In A Sentence

  • My body absorbed that ability as well; my veins are internally hardened against acids.
  • When his friends called him a coward his resolve was only hardened. Times, Sunday Times
  • A pupa covered by the hardened 3rd larval skin is known as a coarctate pupa..
  • ‘This is evident in a number of markets where rents are falling, but yields are not only holding steady, but in most instances hardening,’ he said.
  • Using encapsulated liquid tricyclic, like diolefin, and some kind of catalyst for quick hardening. Archive 2009-03-01
  • They are only preparing them for the preferential treatment awaiting them when they become hardened criminals in modern jails. The Sun
  • It is enough to give the hardened British holidaymaker a complex. Times, Sunday Times
  • As it was, his expression hardened, the catlike sharpness of his pupils glinting dangerously.
  • But what Pete and Katrina can vouch for is a degree of comfort at their events that could convert the most hardened anti-festival goers.
  • Steels usually contain at least 0.3% manganese, which acts in a three-fold manner: it assists in deoxidation of the steel, prevents the formation of iron sulfide inclusions, and promotes greater strength by increasing the hardenability of the steel. CR4 - Recent Forum Threads and Blog Entries
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