teaser
🇺🇸
/ˈtiːzər/
🇬🇧
/ˈtiːzə(r)/
A teaser is a puzzle or a question that is hard to solve or answer.
The math teacher gave us a teaser to solve during the class.
A teaser is also a kind of advertisement that makes you curious about a product but doesn't tell you its name or much about it.
The teaser ad for the new movie was very mysterious and made everyone want to know more.