Definition of "underline" []

• To draw a line under; emphasize or cause to stand out; underscore. (verb-transitive)
• To emphasize; stress. (verb-transitive)
• A line under something, such as a symbol, word, or phrase, used to indicate emphasis or italic type. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "This is her responding to someone else's post on holding beliefs and the validity of beliefs (original post in underline, Amanda's respose in bold):"
• "The underline is a hyperlink, and this is a shameless plug for it."
• "Let's examine what I actually said about you (note the big blue underline, that is a link to your original piece):"