cast down

1.  Throw down, hurl to the ground, as in She cast down her coat on the grass. [Late 1400s]
2.  Bend down, lower, as in He cast down his eyes. [Late 1300s]

The verb has one meaning:

Meaning #1: lower someone's spirits; make downhearted
  Synonyms: depress, deject, get down, dismay, dispirit, demoralize, demoralise