Real Dictionary

marl in American English 1
a mixture of clay, sand, and limestone in varying proportions, that is soft and crumbly and usually contains shell fragments
to cover or fertilize with marl
noun: a friable earthy deposit consisting of clay and calcium carbonate, used esp. as a fertilizer for soils deficient in lime
transitive verb: to fertilize with marl

marl in American English 2
to wind marline around (rope), taking a hitch at each turn
transitive verb: to wind (a rope) with marline, every turn being secured by a hitch

marl in British English 1
noun: a fine-grained sedimentary rock consisting of clay minerals, calcite or aragonite, and silt: used as a fertilizer
verb: to fertilize (land) with marl

marl in British English 2
verb: to seize (a rope) with marline, using a hitch at each turn