A line in the sand is a figurative phrase used to describe a point of no return or a boundary that cannot be crossed. In ancient times, it was literally drawn in the sand to signify a limit or a division between two sides. The term has been used in many contexts, from politics to sports. In this crossword, the solutions are Pharaohs (8 letters), CARAVAN (7 letters), and SOS (3 letters). Pharaohs were the rulers of Ancient Egypt, and they often drew lines in the sand to mark their territories. Caravans were groups of travelers who moved together for safety and protection, and they also used lines in the sand to mark their paths. SOS is an international distress signal used to call for help, and it is also associated with the idea of a line in the sand, as it is a call for assistance when all other options have been exhausted.