Definitions

1. noun

a secondary title for a work, typically displayed below the main title

“The movie’s subtitle was ‘A Journey Through Time’.”

2. verb

to provide a secondary title for (a work)

“The editor decided to subtitle the book with a more descriptive title.”

3. verb

to provide a secondary or explanatory title for (a speech or performance)

“The comedian will subtitle her stand-up comedy act tonight.”