* a rough valley.
   As the word {nachal} signifies both a torrent, and the valley
   or glen through which it flows, {nachal aithan} may be
   rendered a rapid torrent.  Many torrents in Judea are dry
   during a great part of the year; when not only their banks but
   their beds may be ploughed, and yield a crop.  Hence there is
   no impropriety in specifying that such a place should be one
   that "is neither cared nor sown;" while the circumstance that
   the elders were to wash their hands over the heifer, whose
   head had been struck off into the stream, confirms this
   interpretation.  The spot of ground where this sacrifice was
   made must be uncultivated, because it was considered as a
   sacrifice for the atonement of murder, and, consequently,
   would pollute the land.

 * shall strike.
  1Pe 2:21-24  3:18