Declaim at length

• Give a long, grandiloquent speech
• Conclude a speech
• Make a long, grandiloquent speech
• Harangue
• Speak at length

Wiktionary Word definitions in Wiktionary
vb. 1 (context intransitive English) To speak or declaim at great length, especially in a pompous or grandiloquent manner; to harangue. 2 (context intransitive English) To make a peroration; to make a formal recapitulation at the end of a speech.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
c.1600, back-formation from peroration , or else from Latin peroratus , past participle of perorare . Related: Perorated ; perorating .

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Perorate \Per"o*rate\, v. i. [See Peroration .] To make a peroration; to harangue. [Colloq.]

WordNet Word definitions in WordNet
v. conclude a speech with a formal recapitulation deliver an oration in grandiloquent style