Heading into overtime is a phrase used to describe a situation in which a game or competition has gone beyond the allotted time and must continue until a winner is determined. The term is often used in sports, such as basketball, hockey, and soccer, where the game is TIED at the end of regulation time and must continue until one team scores more points than the other. In this case, the crossword solution for the term 'heading into overtime' is 'TIED, ' indicating that the game is currently in a state of stalemate.