Definition:
hardens
- hardensto become harder, tougher, stiffer, etc.
- hardensHARDEN, to make hard (firm and unyielding)
- hardensto reinforce the structure of something to protect it from nuclear attack
- hardensto make unfeeling
- hardens(of a market, prices, etc.) to firm up or rise
- hardensto make hard or harder; to strengthen, reinforce, toughen, or stiffen