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underline definition

under·line (un′dər līn′; also, for v., un′dər līn′)

transitive verb underlined -·lined′, underlining -·lin′·ing

  1. to draw a line beneath; underscore
  2. to stress or emphasize

noun

a line underneath, as an underscore

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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