The crossword solution for the term 'UP (ENLIVENS)' is PEPS. PEPS stands for Positive Emotions and Psychological Strength, which is a concept developed by Barbara Fredrickson, a professor of psychology at the University of North Carolina. This concept suggests that positive emotions can help people to build psychological strength, which in turn can help them to cope with difficult situations and become more resilient. The idea is that positive emotions can help to enliven people and give them the energy and motivation to take on challenges and succeed.