from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To deprive of temper; to make soft.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To deprive of temper, or of the proper degree of temper; to make soft.
from The Century Dictionary and Cyclopedia
- To remove the temper from, as metal; hence, to soften; mollify.
un- + temper (Wiktionary)