1. something that makes one feel sad, depressed, or disappointed
Usage: informal
2. a depressant drug, especially a barbiturate or tranquilizer
Usage: slang

Examples

• The rainy weather was a real downer for our picnic plans.
• Losing the championship game was such a downer for the team.
• That sad movie was a total downer.
• The bad news about the economy is a downer for investors.
• Her constant complaining is always a downer at parties.
• The doctor prescribed a downer to help him sleep.