underline

/ˌʌndərˈlaɪn/
noun
  1. A line drawn under a word or phrase, especially to show emphasis or a link.
    • Add an underline to the heading to make it stand out.
    • The editor used a red underline to mark corrections.
    • In the document, each key term has an underline.
verb
  1. To draw a line under a word or phrase to emphasize it or show its importance.
    • She underlined the title of the book in her notes.
    • The teacher asked students to underline the vocabulary words.
    • Please underline the main idea in each paragraph.
  2. To emphasize or draw attention to something; to show that something is important.
    • The report underlines the risks of ignoring climate change.
    • His speech underlined the importance of community service.
    • The recent events underline the need for better safety measures.
What does "underline" mean? | whatsthatwordmean | whatsthatwordmean