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Etymology
From.

Verb

 * 1) to harden become hardened, dry
 * 2)  to grow unfeeling or stubborn, render hard or obdurate
 * 3)  to harden, pronounce as voiceless
 * 4) to grow stingy or niggardly
 * 5) to become costive or constipated, constipate
 * 6) to temper
 * 1) to become costive or constipated, constipate
 * 2) to temper