"It takes more than a piece of rope to do me in."

"I'll answer it by telling you how long is your piece of rope."

He had to tie the motor down with pieces of rope.

The bartender looks at him and says, "Are you a piece of rope?"

He looked at a knot I had made in a piece of rope.

It was a thin piece of rope with a hard end.

The handle is made from the last piece of rope.

His hands were tied behind him with a crude piece of rope.

Besides, what need was there to defend against a piece of rope?

Usually there is only one piece of rope or string.