1. to emphasize or highlight the importance of something
2. to draw a line under text

1. the symbol _ used in writing, typing, or computing

Examples

• The teacher asked students to underscore the main ideas in the passage.
• His poor performance underscored the need for additional training.
• Please underscore any unfamiliar words in the text.
• The recent events underscore how important it is to be prepared.
• Use an underscore between words in your username.
• The filename contains spaces, so replace them with underscores.
• Her success underscores the value of hard work and dedication.