Underbar vs. Underscore — What's the Difference?

A bar placed under a symbol.

An underscore, also called an underline, low line or low dash, is a line drawn under a segment of text. In proofreading, underscoring is a convention that says "set this text in italic type", traditionally used on manuscript or typescript as an instruction to the printer.

(transitive) To place a bar under (a symbol).

To underline

To put emphasis on; stress

To cause to appear important or deserving of attention

A line drawn under writing or text to indicate emphasis or italic type.

An underline; a line drawn or printed beneath text; the character _.

(music) A piece of background music.

To underline; to mark a line beneath text.

To emphasize or draw attention to.

To draw a mark or line under; to underline.

A line drawn underneath (especially under written matter)

Give extra weight to (a communication);

Draw a line or lines underneath to call attention to