In Rasa Theory, Vyabhichari Bhavas (also called Sanchari Bhavas) are fleeting, transitory emotions that support and intensify the Sthayi Bhava (dominant emotion) to enhance the overall aesthetic experience (Rasa).
For example, in a scene of love (Shringara Rasa), fleeting emotions like doubt, jealousy, anxiety, or excitement may arise temporarily, enriching the main mood.