down‧er /ˈdaʊnə $ -ər/
noun informal1. [countable] a drug that makes you feel very relaxed or sleepy ⇒
upper2. [singular] a person or situation that stops you feeling happy:
The weather was a bit of a downer.3. be on a downer British English to be sad or experiencing a series of sad events:
What’s up with Ruth? She’s been on a downer all week. [TahlilGaran] Dictionary of Contemporary English ▲