The phrase "able to walk" refers to the ability to move or walk independently without assistance. There are several synonyms that can be used to describe this capability. Some of the most common are mobile, ambulatory, and locomotive. These words all suggest a sense of freedom and independence, as well as the ability to move around freely and easily. Other synonyms for "able to walk" include ambulant, ambulate, walkable and perambulate, which all imply the ability to walk or move around without any restrictions or limitations. Overall, there are many different words that can be used to describe someone who is "able to walk," and each carries its own unique connotations and nuances.