different between retund vs retune

English

From Latin retundere, retusum, from re- (“re-”) + tundere (“to beat”).

retund (third-person singular simple present retunds, present participle retunding, simple past and past participle retunded)

(transitive) To blunt; to turn, as an edge.
- Covered with skin and hair keeps it warm, being naturally a very cold part, and also to quench and dissipate the force of any stroke that shall be dealt it, and retund the edge of any weapon.
(transitive, figuratively) To cause to be obtuse or dull.
to retund confidence

re- +? tune

retune (third-person singular simple present retunes, present participle retuning, simple past and past participle retuned)

To tune again.
After the long first movement, the orchestra had to retune.

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