demoralise

动词 demoralise:

1. corrupt morally or by intemperance or sensuality
   同义词：corrupt, pervert, subvert, demoralize, debauch, debase, profane, vitiate, deprave, misdirect
2. lower someone's spirits; make downhearted
   同义词：depress, deject, cast down, get down, dismay, dispirit, demoralize

1. The troops were thoroughly demoralized by this set-back.
   这一挫败使部队士气丧失殆尽。