The word "lame" can refer to something that is physically disabled or unable to walk properly due to injury or illness. In a more figurative sense, it is often used to describe something that is weak, ineffectual, or unsatisfactory. For example, a "lame excuse" would be an excuse that is not convincing or fails to justify an action.
The word "lame" comes from the Old English "lama," which means "crippled" or "lame." It has been used in the English language since the 14th century to describe a physical inability to walk as well as to describe lack of strength in arguments or ideas.