Definition of underlined:
(n) :
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.
(v) :
To draw a line underneath something, especially to add emphasis.
(v) :
(figuratively) To emphasise or stress something.
(n) :
(uncommon) The character _.
(n) :
(dated) An announcement of a theatrical performance to follow, placed in an advertisement for the current one.
(n) :
(dated) A caption beneath a photograph (which may have more than one line of text).