Each of these 2-word phrases contains a letter with flea-like tendencies whose sole aim in life is to leap across to the other word of the phrase! All well and good, but certain rules have to obtain and certain standards uphold in the process. The leap might be from the first word to the second word or from the second word to the first word. Whichever way they leap, the result must be another phrase.
Word Ways: Vol. 41
, Article 9.
Available at: https://digitalcommons.butler.edu/wordways/vol41/iss4/9