1. people or animals that kill other living beings
2. things that cause death or destruction
3. extremely difficult or challenging things
Usage: informal

Examples

• The police are searching for the killers who escaped from prison.
• Serial killers often follow specific patterns in their crimes.
• Heart disease and cancer are among the leading killers in developed countries.
• These final exams are real killers – I’ve been studying for weeks.
• The heat wave was one of the worst killers this summer.
• Drunk drivers are killers on the highway.
• Those math problems were absolute killers on the test.