Downcast

a. Cast downward; directed to the ground, from bashfulness, modesty, or dejection of mind. *'Tis love, she said, and then my downcast eyes And guilty dumbness witnessed my surprise. Dryden.*

n. Sadness; melancholy look. [Obs.] “That downcast of thine eye.” Beau. & Fl.

n. A ventilating shaft down which the air passes in circulating through a mine.