a long narrow range of hills
a long narrow natural elevation or striation
the highest point where two roof slopes meet, forming a horizontal line along the top of the roof
any long raised border or margin of a bone or tooth or membrane
a long narrow natural elevation on the floor of the ocean
any long raised strip
form into a ridge
spade into alternate ridges and troughs
throw soil toward (a crop row) from both sides
plough alternate strips by throwing the furrow onto an unploughed strip
extend in ridges