Keep off

Please keep off the grass.

You keep the dogs off while I go and knock on the door.

"Keep off Conductor Rails" said red-painted notices at the platform ends, for third-rails were laid in many places even where electric trains never normally ran, and there had been many rumours of impending electrification of the Wirral, as a natural extension of the Mersey system, a quarter of a century before the change was actually made.