"graves without makers." Graves were ceremonially unclean because of the dead bodies in them. An unmarked grave did not have a mark to warn people that it was a grave and that there was a dead body there.
If someone walked over a grave, he would become ceremonially unclean because the grave was unclean. Alternate translation: "that people walk over without knowing that it is a grave" or "that people walk over without knowing that is is unclean"
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