Spoonerism - Words About Word Play | Merriam-Webster
https://www.merriam-webster.com/wordplay/playing-with-words/spoonerism
WebSpoonerism. To create a spoonerism one has only to transpose the initial sounds of two or more words, making, for example, "tons of soil" into "sons of toil." The term takes its name from one William Archibald Spooner, a British clergyman and educator who unwittingly committed such transpositions quite frequently, much, we can only assume, to ...
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