    Sentence 1: Of course, if @ researcher tampers with the evidence,  ‘making a unilateral, unsupported claim or assumption that a word  ‘means something that it does not, then that does not constitute  ‘semantic it is what is known as dirty work at the crossroads, and M  ‘and $ are indulging in a bit of mischief by suggesting that semantic  ‘change either has taken place or is taking place because they have  some evidence that a certain change in usage had crept in.    ‘Sentence 2: Semantic change happens when the meaning of words  ‘changes to communities over time.    