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Synonyms

underline

American  
[uhn-der-lahyn, uhn-der-lahyn, uhn-der-lahyn] / ˈʌn dərˌlaɪn, ˌʌn dərˈlaɪn, ˈʌn dərˌlaɪn /

verb (used with object)

underlined, underlining
  1. to mark with a line or lines underneath; underscore.

  2. to indicate the importance of; emphasize, as by stressing or italicizing.


noun

  1. Printing. a caption under an illustration.

  2. a line drawn under something; an underscore.

underline British  

verb

  1. to put a line under

  2. to state forcibly; emphasize or reinforce

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. a line underneath, esp under written matter

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of underline

First recorded in 1715–25; under- + line 1

Vocabulary lists containing underline

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The strategy rests on a paradox Warsh likes to underline.

From The Wall Street Journal • May 21, 2026

Russian President Vladimir Putin meets China's President Xi Jinping in Beijing on Wednesday, seeking to underline their unshakeable alliance in the wake of Donald Trump's visit to the Asian superpower economy.

From Barron's • May 20, 2026

The point, it seems, is to underline the brevity and fragility of her characters’ lives, and of our own.

From Los Angeles Times • May 5, 2026

Josh Bivens, the chief economist at the Economic Policy Institute, pointed to Federal Reserve data to underline the discrepancy between the tariffs Americans have paid versus the refunds they are seeing this year.

From Salon • Apr. 15, 2026

Benefo uses his hands to underline his statement.

From "Kwame Crashes the Underworld" by Craig Kofi Farmer

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