phlegm

noun4

1. •
   Viscid mucus produced by the body, later especially mucus expelled from the bronchial passages by coughing.

   • Even some members of the new bourgeoisie indulge in conspicuously boorish behavior, like hawking phlegm onto the pavement or picking their noses at business meetings. — 2005
2. •
   Calmness of temperament, composure; also seen negatively, sluggishness, indifference.

   • Orloff's phlegm broke completely, and he snatched at the monocle as it dropped[.] — 1941
3. •
   (historical) One of the four humors making up the body in ancient and mediaeval medicine; said to be cold and moist, and often identified with mucus.
4. •
   (historical) A watery distillation, especially one obtained from plant matter; an aqueous solution.