The Collaborative International Dictionary of English v.0.48:
Preachify \Preach"i*fy\ (pr[=e]ch"[i^]*f[imac]), v. i. [Preach + -fy.] To discourse in the manner of a preacher. [Colloq.] --Thackeray. [1913 Webster]WordNet (r) 3.0 (2006):
preachify v 1: speak as if delivering a sermon; express moral judgements; "This man always sermonizes" [syn: sermonize, sermonise, preachify, moralize, moralise]