verb (used with object)
to proclaim or make known by sermon (the gospel, good tidings, etc.).
to deliver (a sermon).
to advocate or inculcate (religious or moral truth, right conduct, etc.) in speech or writing.
verb (used without object)
to deliver a sermon.
to give earnest advice, as on religious or moral subjects or the like.
to do this in an obtrusive or tedious way.

1175–1225; Middle English prechen < Old French pre(ë)chier < Late Latin praedicāre to preach (Latin: to assert publicly, proclaim). See predicate

outpreach, verb (used with object)
unpreached, adjective

5. advocate, profess, pronounce, expound. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
preach (priːtʃ)
1.  to make known (religious truth) or give religious or moral instruction or exhortation in (sermons)
2.  to advocate (a virtue, action, etc), esp in a moralizing way
[C13: from Old French prechier, from Church Latin praedicāre, from Latin: to proclaim in public; see predicate]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late O.E. predician, a loan word from Church L., reborrowed 12c. as preachen, from O.Fr. prechier (11c.), from L.L. predicare "to proclaim publicly, announce" (in M.L. "to preach"), from L. præ- "forth" + dicare "to proclaim, to say" (see diction). To preach to the
converted is recorded from 1867. Preacher (early 13c.) is from O.Fr. preecheor, from L. prædicatorem (nom. prædicator), lit. "proclaimer." Slang short form preach (n.) is recorded from 1968.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases


In addition to the idiom beginning with preach, also see practice what you preach.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Preachers traveled the country, setting up tent revival meetings to preach fire
  and brimstone.
Most hospitals preach quality care but when the rubber hits the road they don't
  provide the resources to deliver the care.
Colleagues said he rarely wrote out what he would preach and could deliver a
  mesmerizing sermon spontaneously.
The college's chaplain, however, had invited me to preach in.
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