I don't quite understand what this sentence means. I haven't heard of it before, so I asked my American friend. He told me: This sentence is very old, and it must be over 100 years. Agile means fast! It is usually what parents say to their children. In order to rhyme. The English name is "RHYME"
This sentence has no deep meaning, just to amuse children, just like when I was a child, my parents also said to us: shake and fly. Same! ! It's the same reason!
What does "shake fly" mean? This is a rhyming sentence, just to amuse the children! !