Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
underline
Grammar usage guide and real-world examplesUSAGE SUMMARY
The word “underline” is correct and usable in written English.
It is used to emphasize or highlight specific words or phrases in a written document. For example, “I always like to underline key words in my notes to help me remember them better.”.
✓ Grammatically correct
News & Media
Formal & Business
Sport
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
That they should miss two glorious opportunities to take a potentially decisive advantage seemed merely to underline the certainty of their looming ordeal.
News & Media
They also underline how little we're told about what we're paying for.
News & Media
The attacks starkly underline an increasing gulf between secular bloggers and conservative Islamic groups, often covertly connected with Islamist parties.
News & Media
Facebook Twitter Google plus Share Share this post Facebook Twitter Google plus close 9.45am AESTony Abbott Abbott was speaking in Melbourne to underline serving up the carbon tax, now surely a lukewarm dish, for the third time.
News & Media
The position of HSBC and previous statements by Nissan underline this.
News & Media
If it is right for them, says Abbott, it is right for the rest of the people in the towns and regions (underline regions) of this country.
News & Media
"At the same time as enforcing the ban in Scotland, the SNP should underline its opposition to the practice across the UK by stating clearly its objection to any repeal of the law in England and Wales".
News & Media
The action was dominated by Ireland's double world and Paralympic champion, Michael McKillop, though, who raced home in the T38 800m to underline his recovery from injury troubles.
News & Media
This part of the legislation will underline Lenihan's pledge that state support will only be given to Allied Irish Banks if its controversial €40m bankers' bonuses are scrapped.
News & Media
The Green party will also hope to increase its parliamentary presence, heavily targeting three seats in a push to underline the increasingly fractured political makeup of the electorate.
News & Media
Cameron used his opening address to underline Britain's strong relationship with France, which he says is getting "more important".
News & Media
Expert writing Tips
Best practice
When using "underline" to emphasize a point in writing, ensure that the context supports the need for emphasis. Overuse can diminish its impact.
Common error
Avoid using "underline" when you intend to imply something subtly. It's better suited for direct, explicit emphasis, not nuanced hints.
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The primary grammatical function of "underline" is as a verb, used to indicate the act of emphasizing something. It can also function as a noun referring to the line itself. Ludwig AI confirms its usability.
Frequent in
News & Media
50%
Formal & Business
25%
Sport
15%
Less common in
Science
5%
Reference
3%
Academia
2%
Ludwig's WRAP-UP
The term "underline" functions primarily as a verb to emphasize or highlight information, but also serves as a noun referring to the line itself. Ludwig AI confirms that the word is grammatically correct and usable in written English. With a neutral register, it finds frequent application in news, business and sports contexts, as supported by examples. Alternatives include "emphasize", "underscore", and "highlight". While versatile, it's important to avoid overuse and ensure it aligns with the desired level of emphasis.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
emphasize
Changes the verb to a more general term for giving importance.
underscore
Uses a synonym that also implies drawing attention to something.
highlight
Replaces with a term suggesting making something more visible or prominent.
accentuate
Implies enhancing the prominence of a feature or point.
stress
Shifts the focus to placing importance on something.
call attention to
Uses a phrasal verb to direct focus toward something.
draw attention to
Similar to "call attention to", but with a slightly different nuance.
lay emphasis on
Uses a more formal expression to indicate importance.
give prominence to
Indicates making something stand out or be more noticeable.
drive home the point
Emphasizes the act of making a point clear and unmistakable.
FAQs
How can I use "underline" in a sentence?
You can use "underline" to emphasize a point, as in "The data "underline" the need for reform", or to literally draw a line under text.
What's another way to say "underline"?
Alternatives include "emphasize", "underscore", or "highlight" depending on the context.
Is it better to "underline" or "highlight"?
The choice depends on the medium. "Underline" is traditional for printed text, while "highlight" is common in digital documents.
What does it mean to "underline" something figuratively?
Figuratively, to "underline" something means to "emphasize" its importance or significance.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested