underscore

[v. uhn-der-skawr, -skohr, uhn-der-skawr, -skohr; n. uhn-der-skawr, -skohr]
verb (used with object), underscored, underscoring.
1.
to mark with a line or lines underneath; underline, as for emphasis.
2.
to stress; emphasize: The recent tragedy underscores the danger of disregarding safety rules.
noun
3.
a line drawn beneath something written or printed.
4.
music for a film soundtrack; background for a film or stage production.

Origin:
1765–75; under- + score

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
underscore
 
vb
1.  to draw or score a line or mark under
2.  to stress or reinforce
 
n
3.  a line drawn under written matter

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

underscore
1771, "to draw a line under," from under + score (v.). The fig. sense of "to emphasize" is attested from 1891. Noun meaning "a line drawn below (something)" is recorded from 1901.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

underscore definition

character
_, ASCII 95.
Common names: ITU-T: underline; underscore; underbar; under. Rare: score; backarrow; skid; INTERCAL: flatworm.
See also left arrow.
(1995-03-06)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The findings underscore doctors' recommendations that people take multivitamins.
Showing up on time is a simple but effective way to underscore your
  professionalism.
Yet, this month's disasters underscore how much more the system still needs to
  change-along with the politicians guiding it.
These stories underscore how far and deep the science of chemistry reaches into
  our modern life.
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