if you give someone or something a clean bill of health, you examine them and state that they are healthy, in good condition, or legal John will have to stay at home until the doctors give him a clean bill of health. Of 30 countries inspected for airline safety only 17 received a clean bill of health.
Cambridge Idioms Dictionary, 2nd ed. Copyright © Cambridge University Press 2006. Reproduced with permission.
a clean bill of health
1. news that you are healthy or well Johnson was given a clean bill of health by his doctors earlier this month.
2. news that an organization is operating correctly The airline received a clean bill of health from federal investigators.
Etymology: based on the literal meaning of a clean bill of health (a statement from a health official that all the people working on a ship are in good health)