(informal)a difficult problem or questionsee alsobrain-teaser
Definitions on the go
Look up any word in the dictionary offline, anytime, anywhere with the Oxford Advanced Learner’s Dictionary app.
(also teaser ad)
an advertisement for a product that does not mention the name of the product or say much about it but is intended to make people interested and likely to pay attention to later advertisements
For the first week we ran a teaser featuring a black cat.
