regruntle

re- +‎ gruntle, from disgruntle.

regruntle (third-person singular simple present regruntles, present participle regruntling, simple past and past participle regruntled)

1. (humorous) To return to humour; to cause a disgruntled person to cease being upset.

   Synonym: gruntle

   • 1946, Printers’ Ink, volume 217, p. 42:

     Here, he thought, is a man in need of a thorough regruntling job.

   • 1981, Time, volume 117, p. 46:

     If the polls reflect a state of public disgruntlement, he [the president] is supposed to take charge of regruntling.