what origin is this made up from?

[Ilona]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #13 "Squeaky Clean", question 1

The auditors made a thorough check on all aspects of the company and decided to give it a clean bill of health.

(a) confirm it was satisfactory
(b) decide it was hygienic
(c) believe it was clean
(d) agree it was organized

English Idioms and Expressions, Advanced Level

ESL/EFL Test #13 "Squeaky Clean", answer 1

The auditors made a thorough check on all aspects of the company and decided to confirm it was satisfactory.

Correct answer: (a) confirm it was satisfactory
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what origin is this made up from?

Ilona

[Yankee]

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)

source
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