Underscore (verb)

1. Mark (something) with a line drawn under it.
2. Emphasize or indicate the importance of (something).

Origin:

Late 19th century: from under- + score.

Examples:

1. He underscored the importance of being on time for the meeting.
2. The word 'urgent' was underscored in the email to indicate its importance.
3. The study underscores the need for more research in this area.
4. The report underscored the negative effects of air pollution on human health.
5. The teacher underscored the main points in the textbook for the students.