the words printed over a film in a foreign language to translate what is being said by the actors:
a French film with English subtitles
a second title below the main title in a book, which gives more information about what is in the book, show etc:
The opera's subtitle is 'The School for Lovers'.
—subtitle verb [intransitive and transitive]
a subtitled version of the film
The book is subtitled 'A Psychology of Masculinity'.