Webster's English Dictionary

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harden

hard.en \'ha:rd-*n\ \'ha:rd-nin, -*n-in\ vb or hard.en.ing 1: to make hard 
   or harder : INDURATE  2: to confirm in dispostion, feelings, or action; esp 
   : to make ca llous {~ed his heart} 3: INURE, TOUGHEN {~ troops}  1: to 
   become hard or harder  2a: to become confirmed or strengthened  2b: to 
   assume an appearance of harshness or severity  3: to become higher or less 
   subject to fluctuations downward