Stressing

verb

1. To apply force to (a body or structure) causing strain.
2. To apply emotional pressure to (a person or animal).
3. To suffer stress; to worry or be agitated.
4. To emphasise (a syllable of a word).

   "“Emphasis” is stressed on the first syllable, but “emphatic” is stressed on the second."

5. To emphasise (words in speaking).