To speak loudly during the main point of a speech is an example of emphasize.
transitive verb-·sized·, -·siz·ing
transitive verbem·pha·sized, em·pha·siz·ing, em·pha·siz·es
- To give emphasis to; stress: She emphasized that the matter was urgent.
- To cause to appear important or deserving of attention: The bank failure emphasized the need for reform.
- To give prominence of sound to (a syllable or word) in pronouncing or in accordance with a metrical pattern.
Origin of emphasizeFrom emphasis
(third-person singular simple present emphasizes, present participle emphasizing, simple past and past participle emphasized)