The term 'Gordian Knot' refers to an intricate knot that was said to have been tied by the ancient King Gordius of Phrygia. According to legend, the knot could only be untied by the one who would become the ruler of Asia. The phrase 'Gordian Knot' has come to refer to any difficult problem or situation that can only be solved with a bold solution. The crossword solution for this term is 'STUMPER', which means something that is difficult to solve or understand.