What is "a clean bill of health"

Clean \Clean\ (kl[=e]n), a. [Compar. Cleaner (kl[=e]n"[~e]r); superl. Cleanest.] [OE. clene, AS. cl[=ae]ne; akin to OHG. chleini pure, neat, graceful, small, G. klein small, and perh. to W. glan clean, pure, bright; all perh. from a primitive, meaning bright, shining. Cf. Glair.]

1. Free from dirt or filth; as, clean clothes.

2. Free from that which is useless or injurious; without defects; as, clean land; clean timber.

3. Free from awkwardness; not bungling; adroit; dexterous; as, a clean trick; a clean leap over a fence.

4. Free from errors and vulgarisms; as, a clean style.

5. Free from restraint or neglect; complete; entire.

   When ye reap the harvest of your land, thou shalt not make clean riddance of corners of thy field.
   --Lev. xxiii. 22.

6. Free from moral defilement; sinless; pure.

   Create in me a clean heart, O God.
   --Ps. li. 10

   That I am whole, and clean, and meet for Heaven
   --Tennyson.

7. (Script.) Free from ceremonial defilement.

8. Free from that which is corrupting to the morals; pure in tone; healthy. ``Lothair is clean.''
   --F. Harrison.

9. Well-proportioned; shapely; as, clean limbs.

   A clean bill of health, a certificate from the proper authority that a ship is free from infection.

   Clean breach. See under Breach, n., 4.

   To make a clean breast. See under Breast.