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

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