harden
Verbs
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(v) become hard or harder
- The wax hardened
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(v) make hard or harder
- The cold hardened the butter
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(v) harden by reheating and cooling in oil
- temper steel
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(v) make fit
- This trip will season even the hardiest traveller
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(v) cause to accept or become hardened to; habituate
- He was inured to the cold