WordReference Random House Unabridged Dictionary of American English © 2020
clean bill of health, 
  1. a certificate of health attesting the lack of a contagious disease, as on a ship.
  2. an assurance, as by a doctor, that one is in good health.
  3. Also,  clean bill. an assurance, esp. an official verdict by a committee, that a group or an individual has proved, under investigation, to be morally sound, fit for office, etc.
  • 1850–55

WordReference Random House Unabridged Dictionary of American English © 2020
bill of health, 
  1. Naval Termsa certificate, carried by a ship, attesting to the presence or absence of infectious diseases among the ship's crew and at the port from which it has come.
  2. Idiomsclean bill of health, an attestation of fitness or qualification;
    a commendation:The investigating committee gave him a clean bill of health.
  • 1635–45

Collins Concise English Dictionary © HarperCollins Publishers::
bill of health n
  1. a certificate, issued by a port officer, that attests to the health of a ship's company
  2. clean bill of healthinformal a good report of one's physical condition
  3. a favourable account of a person's or a company's financial position
'clean bill of health' also found in these entries (note: many are not synonyms or translations):
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