Rapunzel's Lock is a term that refers to the long, golden hair of the character Rapunzel from the Brothers Grimm fairy tale. The term is often used to describe a situation where someone is trapped or held back from achieving their goals. In the story, Rapunzel's hair is used as a rope by her captor, the witch, to climb up and down the tower in which she is kept. The crossword solution for Rapunzel's Lock is 'TRESS, ' which is a five-letter word meaning a head of hair.