1. radioactive particles that fall to earth after a nuclear explosion
2. the unpleasant results or effects of an event or situation

Examples

• The nuclear test created dangerous fallout that spread for miles.
• Scientists measured radiation levels in the fallout zone.
• The political fallout from the scandal lasted for months.
• There was serious fallout after the company’s data breach.
• The fallout from their argument affected the whole family.
• Emergency crews monitored fallout patterns after the accident.
• The CEO resigned due to fallout from the investigation.