The crossword solutions for the term NOT PLAY are REST (4 letters) and SIT (3 letters). REST is an acronym for 'REST and Exercise for Stress Treatment' and is a form of relaxation therapy. It involves deep breathing, muscle relaxation, and visualization techniques to reduce stress and anxiety. SIT is an acronym for 'SIT and Think', which is a form of mindfulness meditation. It involves focusing on one's thoughts and feelings in order to become more aware of them and to gain insight into one's life. Both REST and SIT are activities that involve not playing, but rather taking time to relax and reflect.