When a speaker over-emphasizes a word or phrase to achieve a powerful meaning, this refers to the vocal component of delivery, also known as vocalic or paralanguage. A vocalic technique includes rate, pitch, fluency, volume, pauses, articulation, pronunciation, voice tone, and voice inflection.
If you have a good technique using voice inflection, you can emphasize a word or phrase to achieve a powerful meaning for your audience. You can use vocal variety to let you change your volume and pitch when speaking. Do not forget to pay attention to the other techniques of the vocal component, particularly pronunciation, articulation, fluency, and so on.
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