Do you know what this means?

I know of it as a warden, or someone who has control of the keys in a jail setting. I'm uming that isn't what you had in mind. So then I had to look it up, but originally, I guess you could say, I didn't know it meant that (what your father is meaning it as). Try www.Thesaurus.com, and www.dictionary.com. I love those websites and they've helped me with many papers I had to write!