underline
v. B1 Intermediate US //ˈəndɝˌɫaɪn// un·der·line
v. to draw a line under a word or phrase to show it is important. You can do this with a pen or a keyboard.
v. to draw a line beneath a word or phrase to indicate emphasis or to highlight a specific point.
Please underline the most important words in the text.
The teacher asked the students to underline any unfamiliar vocabulary in the chapter to help with their study.
By underlining the key arguments in the report, the committee ensured that the executive board would immediately recognize the most critical points during the presentation.
From under- + line.