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The Collaborative International Dictionary
Retund

Retund \Re*tund"\, v. t. [L. retundere, retusum; pref. re- re- + tundere to beat.] To blunt; to turn, as an edge; figuratively, to cause to be obtuse or dull; as, to retund confidence.
--Ray. Cudworth.

Wiktionary
retund

vb. 1 To blunt; to turn, as an edge. 2 (context figuratively English) To cause to be obtuse or dull.