For want of a better name [=since we don't have a better name to use], let's call it “Operation One.”既然没有更好的名字，我们就叫它“一号行动”吧。

People are dying for want of medical treatment. [=because they are not getting medical treatment]人们由于缺乏治疗而面临死亡。

The project failed for the want of adequate funding.由于缺少足够的资金，这个项目流产了。