clean bill of health

clean′ bill′ of health′,

a certificate of health attesting the lack of a contagious disease, as on a ship.
an assurance, as by a doctor, that one is in good health.
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.

bill′ of health′,

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.
Idioms clean bill of health, an attestation of fitness or qualification;
a commendation:The investigating committee gave him a clean bill of health.

Collins Concise English Dictionary © HarperCollins Publishers::

bill of health n

a certificate, issued by a port officer, that attests to the health of a ship's company
clean bill of health ⇒ informal
- a good report of one's physical condition
- a favourable account of a person's or a company's financial position

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