The phrase "in seven-league boots" is an idiomatic expression that describes someone's ability to cover a lot of ground quickly and efficiently. However, there are several other synonyms that can be used to convey similar meanings. For instance, the phrase "lightning-fast" is often employed to describe someone's swift movements, as is "like a hare," which alludes to the speed and agility of the animal. "Zooming" suggests the rapid movement of an object or person, while the term "whizzing" can be used to describe someone who is moving so quickly that they are almost a blur. Finally, "racing" or "sprinting" can also be used to describe someone's swift movements.