a word, phrase, or sentence that is used as the second part of a book title and is printed under the main title at the front of the book

The subtitle of this biography is "The Making of an American".

words shown at the bottom of a film or television picture to explain what is being said

The Chinese movie was shown with English subtitles. 这部中国电影放映时配了英文字幕。

The evening news has subtitles for the deaf. 晚间新闻为聋哑人士配了字幕。