1. the end of the world; the last day of the world’s existence
Usage: often capitalized when referring to religious contexts
2. a time of catastrophic destruction or disaster
Usage: often used figuratively

Examples

• Many religions have prophecies about doomsday.
• The scientist warned that climate change could lead to an environmental doomsday.
• The movie depicted a nuclear doomsday scenario.
• She prepared for doomsday by stockpiling supplies.
• The economic collapse felt like financial doomsday for many families.
• Doomsday predictions have existed throughout human history.