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.
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.
To utter in public; to deliver in a rhetorical or set manner.
To defend by declamation; to advocate loudly. [Obs.] "Declaims his cause." South.
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