פּירוש אויף דברים 27:17

מסיג גבול [CURSED BE] HE THAT REMOVES [HIS NEIGHBOUR’S] LAND-MARK — i.e. puts it further back in his neighbor’s field and thereby steals ground from him. The word מסיג has the same meaning as the verb in (Isaiah 59:14) “and he is turned backwards (הֻסַּג )".

removes his neighbor’s landmark This is an act done in secrecy, as is misleading a blind person, since the victim cannot make known who misled him.

מסיג גבול, “who removes his neighbour’s landmark.” The perpetrator certainly would not do such a thing in broad daylight. Similarly, he would not deliberately make a blind person go astray where there were witnesses observing this. He knows that the blind person himself cannot identify him.