Verb
To print in Italic characters; to underline written letters or words with a single line; as, to Italicize a word; Italicizes too much.
Source: Webster's dictionaryConversely, I didn’t want to italicize the words of Spanish that I include in the book, because this is Arturo and Faustino’s world, and Spanish is their language. Source: Internet
The text editor allows you to bold, italicize, and underline type, as well as change the font size, color, and background color. Source: Internet