False step is an idiom that means to make a mistake or misstep. It can be used to describe a physical misstep, such as tripping, or a figurative misstep, such as making a wrong decision. The crossword solutions for false step are FLUFF and ERROR. FLUFF is a noun meaning something light and soft, like feathers or cotton. It can also mean something trivial or insignificant. ERROR is a noun meaning a mistake or inaccuracy. It can also refer to a malfunction or defect.