crag /ˈkræg/
  峭壁,危岩
  Crag n.
  1. A steep, rugged rock; a rough, broken cliff, or point of a rock, on a ledge.
     From crag to crag the signal flew.   --Sir W. Scott.
  2. Geol. A partially compacted bed of gravel mixed with shells, of the Tertiary age.
  Crag, n.
  1. The neck or throat [Obs.]
     And bear the crag so stiff and so state.   --Spenser.
  2. The neck piece or scrag of mutton.
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  crag
       n : a steep rugged rock or cliff