The Collaborative International Dictionary
Declaim \De*claim"\ (d[-e]*kl[=a]m"), v. i. [imp. & p. p. Declaimed (d[-e]*kl[=a]md"); p. pr. & vb. n. Declaiming.] [L. declamare; de- + clamare to cry out: cf. F. d['e]clamer. See Claim.]
To speak rhetorically; to make a formal speech or oration; to harangue; specifically, to recite a speech, poem, etc., in public as a rhetorical exercise; to practice public speaking; as, the students declaim twice a week.
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To speak for rhetorical display; to speak pompously, noisily, or theatrically; to make an empty speech; to rehearse trite arguments in debate; to rant.
Grenville seized the opportunity to declaim on the repeal of the stamp act.
--Bancroft.
Wiktionary
vb. (present participle of declaim English)
Usage examples of "declaiming".
And Guxx and the dragon were once again ignoring my edict about declaiming and singing.
An hour later in the kitchen Declan was still declaiming to an enraptured group.
Then a voice of a priest, declaiming the history of the long war between Akha and Wutra.
And the kids were completely enchanting, with their little bonnets and their cardboard rifles, declaiming their lines as though their lives depended on it.