obsess [obsessed, obsessing, obsesses](to dominate the thoughts of someone) verb [UK: əb.ˈses] [US: əb.ˈses]I'm obsessed with this melody. = Estoy obsesionado con esta melodía.
obsesionarse verb
obsess [obsessed, obsessing, obsesses](to be preoccupied with a single topic or emotion) verb [UK: əb.ˈses] [US: əb.ˈses]