1. a sudden fall in status, fortune, or condition; a reversal of luck or prosperity
Usage: usually singular or plural; often used in the phrase 'a downcome'
2. a pipe or duct that carries something downward, especially in plumbing or ventilation systems
Usage: technical; chiefly British

Examples

• His sudden downcome from wealth to poverty shocked everyone in the community.
• The scandal led to the executive's downcome and forced resignation.
• After years of success, the company faced a dramatic downcome.
• The downcome of the old regime was swift and unexpected.
• The building's downcome system efficiently directs rainwater away from the foundation.