1. underline; underscore
Wikipedia definition
2. UnderlineAn underline, also called an underscore, is one or more horizontal lines immediately below a portion of writing. Single, and occasionally double ("double-underscore"), 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.
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