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.
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            That Cristes gospel truly wolde preche. --Chaucer.
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            The Lord hath anointed me to preach good tidings
            unto the meek.                        --Isa. lxi. 1.
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   2. To inculcate in public discourse; to urge with earnestness
      by public teaching. "I have preached righteousness in the
      great congregation." --Ps. xl. 9.
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   3. To deliver or pronounce; as, to preach a sermon.
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   4. To teach or instruct by preaching; to inform by preaching.
      [R.] "As ye are preached." --Southey.
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   5. To advise or recommend earnestly.
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            My master preaches patience to him.   --Shak.
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   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.
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