mow down

verb2

1. •
   To cut down, especially in large numbers.

   • Our forecast calls for a return of summery weather in the 80s this weekend, so we actually can get out and mow down those weeds without having to inhale clouds of dust. — 2006
2. •
   (figurative) To kill or slaughter, or to injure by knocking down, especially in large numbers and in a ruthless manner.

   • [T]heir machine-gunners mowed down wave after wave of counterattacking Chinese. — 1952