VERB
使士气低落;使失去信心;使泄气
If something demoralizes someone, it makes them lose so much confidence in what they are doing that they want to give up.
例句
Clearly, one of the objectives is to demoralize the enemy troops in any way they can.
很明显，目标之一就是要用一切可能的手段打击敌军的士气。