Lose momentum is a term used to describe the gradual decrease in speed or intensity of something. The crossword solutions for this term are SLOW (4 letters), SAG (3 letters), TIRE (4 letters), FALTER (6 letters), GOCOLD (6 letters) and GOFLAT (6 letters). All of these words can be used to describe the gradual decrease in speed or intensity of something, with SLOW being the most general and GOFLAT being the most specific.