Do you often use the expression "down to dust"?
No, it's not a very common expression. To be honest, this is the only time that I have ever heard of this phrase. "Down to dust" in this song means to take away her confidence; to keep her from speaking out or being herself. In this song, she is saying that she won't let anyone stop her from being herself nor will she let them take away her confidence. This movie takes place in a time where anyone who was considered different were often ridiculed and families would hide these individuals away to avoid embarrassment. Thank you for your question!