An expression used by a character numerous times in a work. Merely uttering this phrase in the office will clue others in to the character you're referring to.
To be a Catchphrase, the phrase must be repeated multiple times in an identifiable way — what is simply the most memorable line of a movie is not a Catchphrase unless it is repeated by the same in-universe character. When it's the audience that adopts a character's line as a Catchphrase, it's a Memetic Mutation.
If the character has a Badass Creed, it will probably double as a Catchphrase. Beam Me Up, Scotty! is a false or oft-misquoted Catchphrase. Compare Arc Words, One-Liner, Other Stock Phrases, Word Power. Contrast with Author Catchphrase, which is when a phrase is recycled across unrelated works by the same author/actor/creator.
Don't get your brains mixed up on this game show, which was just named for this trope.note
Catchphrase has been suggested to play 16 roles. Click below to see other actors suggested for each role, and vote for who you think would play the role best.