Definitions

1. noun

Something or someone that depresses or disappoints, such as a sad movie or a disappointing experience.

“The sad ending of the movie was a downer for the whole audience.”

2. verb

To have a depressing or disappointing effect on someone.

“The news had the effect of downing her mood all day.”

3. adjective

Depressing or disappointing.

“The rainy day was a downer, so they decided to stay indoors.”