Vocabulary: What Rhymes with Purple?

What rhyme with purple? Hirple!

Hirple: walk with a limp; hobble.
Oxford Dictionaries Online

I'm fairly certain that the word hasn't seen any real use since the 15th century, and never in America, but it's interesting for two reasons. The first, of course, is that it rhymes perfectly with "purple." The second interesting point is that it made me think about the different words for human locomotion and the subtle differences between them. What is the variation to "hirple" that set it apart from "limp" or "hobble?" Why didn't "hirple" remain in common use? There doesn't seem to be a solid answer, but perhaps it's just that fewer people have been hirpling since 600 years ago.