spit(redirected from spit tacks)
Also found in: Dictionary, Thesaurus, Medical, Legal, Idioms.
a low and narrow alluvial strip of land in the coastal zone of a sea or lake. Attached at one end to the shore, a spit is composed of sand, pebbles, gravel, and shells. It is formed through alongshore displacement of debris as a result of bending of the shore cusp by a flow of debris. Sometimes a spit is formed from the intake of debris along the shore from two opposite directions. Such a spit sharply protrudes into the open sea and is called a tongue (for example, Dolgaia Kosa on the coast of the Sea of Azov).