    Sentence 1: Of course, if a 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 S 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: When researchers apply the label  semantic, they always do so with great care.