downer

Short definition from Wiktionary

Noun

1. 1
   A negative drug trip.
2. 2
   A drug that has depressant qualities.
3. 3
   Something or someone disagreeable, dispiriting or depressing; a killjoy.
4. 4
   A livestock animal that has collapsed.
5. 5
   A form of industrial action in which workers down tools and refuse to work.
6. 6
   A sixpence.

Proper noun

1. 1
   A surname.
2. 2
   A suburb of Canberra, Australian Capital Territory, Australia, named after John Downer.
3. 3
   An unincorporated community in Clay County, Minnesota, United States.