TUNE IN is a phrase that is used to encourage people to pay attention to something. The crossword solutions for this phrase are LISTEN (6 letters), DIAL (4 letters), HEAR (4 letters), and PARTICIPATE (11 letters). LISTEN implies actively paying attention to something, while DIAL suggests tuning in to a radio or television station. HEAR implies being able to detect sound, and PARTICIPATE implies taking part in an activity. All of these words can be used to describe the act of paying attention to something.