Sentence:  Mr Sadler added that he had “seen quite a bit” of “<WSD>Roget-ing</WSD>”, which he described as “disguising plagiarism by substituting synonyms, one word at a time with no attempt to understand either the source or target text”. 
Meaning of the word marked with <WSD> tags:  To use or to mention synonyms;  to replace words in a text with synonyms in order to disguise plagiarism.