be on one's knees

Now he came back to George and put his head on her knee.

So she took the baby herself, and set him on her knee.

He had his hand on a real live girl's knee!

He took me out and got down on one knee.

But in less than a moment I went down on one knee by his side.

He came to rest on one knee, looking up at the two.

Red held up his hand and went down on one knee.

She went down on one knee, to hear him better.

I'm going to get down on one knee and ask for your hand.

And then he had gone down on one knee before her.