drop out /ˌdrɑpˈaʊt/
 掉落,掉出;退出,退學


 drop out
 偶出


 drop out
      v 1: give up in the face of defeat of lacking hope; admit defeat;
           "In the second round, the challenger gave up" [syn: {give
           up, fall by the wayside, drop by the wayside, {throw
           in, throw in the towel, quit, chuck up the sponge]
           [ant: enter]
      2: leave school or an educational program prematurely; "Many
         students drop out because they are not prepared for our
         challenging program"