If you declaim, you speak dramatically, as if you were acting in a theatre. He raised his right fist and declaimed: `Liar and cheat!' He used to declaim French verse to us. to speak loudly, sometimes with actions, so that people notice you (declamare, from clamare )
The act or art of declaiming; rhetorical delivery; haranguing; loud speaking in public; especially, the public recitation of speeches as an exercise in schools and colleges; as, the practice declamation by students