underscore, underline (verb)

a line drawn underneath (especially under written matter)

underscore, underline, emphasize, emphasise (verb)

give extra weight to (a communication)

"Her gesture emphasized her words"

underline, underscore (verb)

draw a line or lines underneath to call attention to

underline (Noun)

A line placed underneath a piece of text in order to provide emphasis or to indicate that it should be viewed in italics or that it acts as a hyperlink

underline (Noun)

An character

underline (Verb)

To draw a line underneath something, especially to add emphasis; to underscore

underline (Verb)

To emphasise or stress something

underline (Verb)

To influence secretly.

underline (Adjective)

Passing under a railway line.

Underline

An underline, also called an underscore, is one or more horizontal lines immediately below a portion of writing. Single, and occasionally double, underlining was originally used in hand-written or typewritten documents to emphasise text. In a manuscript to be typeset, various forms of underlining were conventionally used to indicate that text should be set in a special typeface such as italics to show emphasis, part of a procedure known as markup. With the advent of word processing, different typefaces can be used in the manuscript directly, so that underlining is no longer needed for markup; but underlining is sometimes used in documents in its own right. Underlines are sometimes used as a diacritic, to indicate that a letter has a different pronunciation to its non-underlined form.