Does the word "tease" and "teaser" for the movie trailer is somewhat related?
To "tease" someone means to make fun of them in a playful or joking way. A "teaser" can refer to a short clip of something used for an advertisement of a product that only gives a short introduction to the product. It is called a "teaser" because it does not reveal the full thing but only gives a little bit away. The word "teaser" is sometimes used to replace "trailer" for movies, because movie trailers are advertisements for movies that get people wanting to watch them in the theater. Sometimes movie trailers are also called "teaser trailers".
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