The meaning of UNDERLINE is to mark (something, such as a word) with a line underneath. How to use underline in a sentence.

UNDERLINE definition: 1. to draw a line under a word, especially in order to show its importance: 2. to emphasize: 3…. Learn more.

UNDERLINE definition: to mark with a line or lines underneath; underscore. See examples of underline used in a sentence.

If you underline something such as a word or a sentence, you draw a line underneath it in order to make people notice it or to give it extra importance. Underline the following that apply to you. [VERB …

underline - WordReference English dictionary, questions, discussion and forums. All Free.

Jul 17, 2025 · Unpack "underline" – from its origin as a literal mark of emphasis to its roles in highlighting importance and revealing underlying principles. Discover comprehensive definitions, real …

Underline can be a noun and a verb. You can ask someone "to underline" something. ("Please underline all the errors.") In the above example, we can say that butter is "underlined". We can also …