subtitle
noun
[ ˈsʌbtʌɪt(ə)l ]
• captions displayed at the bottom of a cinema or television screen that translate or transcribe the dialogue or narrative.
• "films in foreign languages with English subtitles"
• a subordinate title of a published work or article giving additional information about its content.
• "the book had now acquired its final title with a qualifying subtitle"
subtitle
verb
• provide (a film or programme) with subtitles.
• "much of the film is subtitled"
• provide (a published work or article) with a subtitle.
• "the novel was aptly subtitled"
