drop behind

动词 drop behind:

1. to lag or linger behind
   同义词：drag, trail, get behind, hang back

1. John and Jack had dropped behind in order to be alone and have a talk.
   为了能单独在一起谈谈，约翰和杰克故意走在别人后面。
2. Soon I dropped behind the rest of the class.
   不久我就落在班上其他同志后面了。