The Collaborative International Dictionary of English v.0.48:
Preach \Preach\, v. t.
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." --Ps. xl. 9.
3. To deliver or pronounce; as, to preach a sermon.
4. To teach or instruct by preaching; to inform by preaching.
[R.] "As ye are preached." --Southey.
5. To advise or recommend earnestly.
My master preaches patience to him. --Shak.
To preach down, to oppress, or humiliate by preaching.
To preach up, to exalt by preaching; to preach in support
of; as, to preach up equality.