Place your right foot on a sturdy surface behind you, approximately at knee height.

In the center of the large interior hut was a low circular table at about knee height.

An engine monitor panel is to the right of the wheel, about knee height.

The wall in this place ran along the crest of the hill and was low, little more than knee height.

She bent and drew an imaginary line at knee height.

He could see the battlements below him, not much more than knee height.

I pulled them so that they extended into the corridor at knee height.

Then he looked down, and there it was, at knee height: five numbers written in black.

The length varies but front and back normally reach knee height on an average person.

Hedges below knee height are generally thought of as borders.