1. to draw a line under a word or phrase
2. to emphasize or stress the importance of something

1. a line drawn under a word or phrase

Examples

• Please underline the main idea in each paragraph.
• The teacher asked us to underline all the verbs in the sentence.
• His speech underlined the need for better education funding.
• The accident underlined the importance of wearing seat belts.
• She drew a red underline beneath the key terms.
• The underline made the word stand out on the page.
• Don’t forget to underline the title of your essay.