(idiomatic) To become farther from another traveling the same course.
Gain-ground Sentence Examples
Numerically, the contending armies would at this very critical juncture of the campaign be almost equal, the invaders rather the stronger; but the Turks were much dispersed, so that the result almost hinged upon the speed with which the attacking side should gain ground before the defenders had time to concentrate.
When the view commenced to gain ground that whitebait were largely young herring, the question arose whether or not the immense destruction of the young brood caused by this mode of fishing injuriously affected the fishery of the mature herring.
Meade was to "hammer" Lee, and Sherman, at the head of the armies which had been engaged at Chattanooga and Knoxville, was to deal with the other great field army of Confederates under Johnston, and as far as possible gain ground for the Union in the south-east.