E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Bosom Sermons.
Written sermons, not extemporary ones or from notes. Does it not mean committed to memory or learnt by heart?
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The preaching from bosom sermons, or from writing, being considered a lifeless practice before the Reformation.Blunt: Reformation in England, p. 179.