How to Say "to underscore" in Spanish
The Spanish word for “to underscore” is “subrayar” — A2 level. This is a very common word in everyday Spanish.

Examples
Debes subrayar el título de cada capítulo.
You should underline the title of each chapter.
He subrayado las palabras que no entiendo.
I have underlined the words that I don't understand.
Si subrayas todo el libro, no sabrás qué es lo más importante.
If you underline the whole book, you won't know what is most important.
A regular 'ar' verb
This verb follows the standard pattern for verbs ending in 'ar,' so if you know how to conjugate 'hablar,' you already know how to use this word!
Used with objects
This word usually describes an action you do to something (like a word or a sentence), so you will often see it followed by a noun.
Thinking it means 'to highlight'
Mistake: “Usar un 'subrayador' para pintar sobre el texto.”
Correction: Technically, 'subrayar' means to draw a line UNDER, whereas 'resaltar' is used for using a highlighter marker. However, in casual talk, people sometimes use them interchangeably.
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