n a long narrow natural elevation or striation
n any long raised strip
n a long narrow natural elevation on the floor of the ocean
n a long narrow range of hills
n any long raised border or margin of a bone or tooth or membrane
n a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters
v extend in ridges
v plough alternate strips by throwing the furrow onto an unploughed strip
v throw soil toward (a crop row) from both sides
v spade into alternate ridges and troughs
v form into a ridge