The crossword solutions for the term ENLIVENS, WITH 'UP' are PEPS. PEPS stands for Positive Emotions and Psychological Strengths, which is a concept developed by Barbara Fredrickson, a professor of psychology at the University of North Carolina. This concept suggests that positive emotions and psychological strengths can help people to become more engaged in life and to experience greater well-being. The idea is that by focusing on positive emotions and psychological strengths, people can become more energized and motivated to take action and make meaningful changes in their lives.