unpreach

From un- +‎ preach.

unpreach (third-person singular simple present unpreaches, present participle unpreaching, simple past and past participle unpreached)

1. (transitive) To undo or overthrow (something) by preaching; to recant (something preached before).
   • 1701 January (indicated as 1700), [Daniel Defoe], “(please specify the page)”, in The True-Born Englishman. A Satyr, [London: s.n.], →OCLC:

     The clergy their own principles denied: Unpreach'd their non-resisting cant, and pray'd / Their liberty and property's so dear

   • 1855, Charles Kingsley, “How They Took the Pearls at Margarita”, in Westward Ho!: Or, The Voyages and Adventures of Sir Amyas Leigh, Knight, , volume II, Cambridge, Cambridgeshire: Macmillan & Co., →OCLC, page 269:

     [Y]et for a priest of the Church of England, […] to show the white feather in the hour of need, is to unpreach in one minute all that he had been preaching his life-long.

• Uncapher, pauncher