IPA: /ˈtiːzər/
KK: /ˈtiːzər/
A person or thing that teases, often used to describe a playful or teasing remark, or a promotional item that attracts attention.
The movie trailer was a great teaser that made everyone excited to see the film.
Teaser → It is formed from "tease" (from Old French *teser*, meaning to touch lightly or provoke) and the suffix "-er" (meaning a person who). A teaser is a person who provokes or annoys others playfully.
Think of someone who playfully 'provoke' others — that's what a 'teaser' does, and the '-er' just means a person.