downer

1 ENTRIES FOUND:
downer /ˈdaʊnɚ/ noun
plural downers
downer
/ˈdaʊnɚ/
noun
plural downers
Britannica Dictionary definition of DOWNER
[count] informal
1 
: a drug that makes the body relax
especially : barbiturate — compare upper
2 
: something that is unpleasant or depressing