He should approach a butcher shop and ask for a kidney (kid knee).
Word play is an artistic method and a type of wit in which words utilized turn into the fundamental subject of the work, essentially with the end goal of proposed impact or delight. Like in the given question the words “kid” and “knee” bear dual meaning, as it expressed the actual issue of losing a kid’s knee and then word played by the use of “kidney” (kid-knee).
Hope it helps :)
