The term 'petered out' is a phrase used to describe the gradual decline of something, usually energy or enthusiasm. The crossword solutions for this term are 'EBBED' (5 letters), 'WANED' (5 letters), 'randry' (6 letters), 'diedaway' (8 letters), 'dwindled' (8 letters), and 'loststeam' (9 letters). All of these words refer to a gradual decrease in something, and can be used to describe the same concept as 'petered out'.