This is the 647th most frequent Italian word.
sottolineato
"Underlined."
Here, "sottolineato" is used as an adjective describing the text being underlined.
Il testo sottolineato è importante per il compito.
The underlined text is important for the assignment.
In this case, "sottolineato" is the past participle of the verb "sottolineare," indicating the completed action of underlining.
Ho sottolineato le parti rilevanti del documento.
I underlined the relevant parts of the document.
Here, "sottolineato" is used metaphorically to indicate emphasis placed on the key concept, employing the past participle as part of a passive construction.