Definitions from Wiktionary (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 (in electronic documents) that it acts as a hyperlink.
▸ noun:  (uncommon) The character _.
▸ noun:  (dated) An announcement of a theatrical performance to follow, placed in an advertisement for the current one.
▸ noun:  (dated) A caption beneath a photograph (which may have more than one line of text).
▸ verb:  To draw a line underneath something, especially to add emphasis.
▸ verb:  (figuratively) To emphasise or stress something.
▸ verb:  (figurative, obsolete) To influence secretly.
▸ adjective:  Passing under a railway line.

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