In simple terms, if we define the term spinning, then it is all known as about rewriting of the paragraph or even the whole of the paper straight in your own words. Unlike into the concept of the summarizing, you will be keeping every single thing as rough and in the same length as the original one. You can easily perform this task as by means of going through the original and hence changing every other word for the purpose of the synonym by means of using the thesaurus. You should be finding yourself as all the time repeating on with the portions of the original document.
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Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article.