Turning Sailboat Picture Sailboat Question? What Do You Call This.....?

Sailboat Question? What do you call this.....? - turning sailboat picture

Is there a technical name for himself when a boat is on the side does not turn on? I think that happens when changing direction. I was in the Nathaniel Bowditch Windjammer for a week in Maine and I could not believe it really the end. The first, unexpected and unprepared, I almost fell in, I'm not really explain it. I hope I have the right idea. All comments are welcome, I promise to read everyone!