mow down

US /maʊ daʊn/
UK /maʊ daʊn/
"mow down" picture
1.

to kill or destroy many people or things in a quick and violent way

:
The machine guns mowed down the advancing soldiers.
The car suddenly swerved and mowed down a row of mailboxes.
2.

to cut down grass or crops using a machine

:
He spent the afternoon mowing down the tall weeds in the garden.
The farmer used a large tractor to mow down the wheat field.