Webster's Revised Unabridged Dictionary · 1913

Preach

Preach , intransitive verb

[Old English prechen, Old French preechier, French prêcher, from Latin praedicare to cry in public, to proclaim; prae before + dicare to make known, dicere to say; or perhaps from (assumed) Late Latin praedictare. See Diction, and compare Predicate, Predict.]

1.
To proclaim or publish tidings; specifically, to proclaim the gospel; to discourse publicly on a religious subject, or from a text of Scripture; to deliver a sermon.
How shall they preach, except they be sent? — Rom. x. 15
From that time Jesus began to preach. — Matt. iv. 17
2.
To give serious advice on morals or religion; to discourse in the manner of a preacher.

Preach , transitive verb

1.
To proclaim by public discourse; to utter in a sermon or a formal religious harangue.
That Cristes gospel truly wolde preche. — Chaucer
The Lord hath anointed me to preach good tidings unto the meek. — Isa. lxi. 1
2.
To inculcate in public discourse; to urge with earnestness by public teaching.
I have preached righteousness in the great congregation. — Bible (KJV) - Psalm xl. 9
3.
To deliver or pronounce; as, to preach a sermon.
4.
To teach or instruct by preaching; to inform by preaching. [Rare]
As ye are preached. — Southey
5.
To advise or recommend earnestly.
My master preaches patience to him. — Shakespeare
Collocations (2)
To preach down , to oppress, or humiliate by preaching. — Tennyson
To preach up , to exalt by preaching; to preach in support of; as, to preach up equality.

Preach , noun

[Compare French prêche, from prêcher. See Preach, v.]

A religious discourse. [Obsolete] — Hooker