cliff       
noun [ C ] uk/klɪf/ us/klɪf/
B1 (常指海岸的)悬崖,峭壁
a high area of rock with a very steep side, often on a coast
  Keep away from the edge of the cliff - you might fall. 离悬崖边远一点——会掉下去的。 
 the cliff edge 峭壁边缘 
 - More examples
 - They built a house at the foot of a cliff.
 - The car skidded and plunged headlong over the cliff.
 - Sand carried by the wind has hollowed out the base of the cliff.
 - Come away from that cliff edge! You're giving me the jitters!
 - Harold jumped out of the car just before it went over the cliff.