[verb uhn-der-lahyn, uhn-der-lahyn; noun uhn-der-lahyn]
- to mark with a line or lines underneath; underscore.
- to indicate the importance of; emphasize, as by stressing or italicizing.
- Printing. a caption under an illustration.
- a line drawn under something; an underscore.
Origin of underline
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- to put a line under
- to state forcibly; emphasize or reinforce
- a line underneath, esp under written matter
Word Origin and History for underliner
Online Etymology Dictionary, © 2010 Douglas Harper