American Dictionary of the English Language

DECLA'IM, verb intransitive [Latin to cry out.]

1. To speak a set oration in public; to speak rhetorically; to make a formal speech, or oration; as, the students declaim twice a week.

2. To harangue; to speak loudly or earnestly, to a public body or assembly, with a view to convince their minds or move their passions.

DECLA'IM, verb transitive

1. To speak in public.

2. To speak in favor of; to advocate.