dam

(noun) a barrier constructed to contain the flow of water or to keep out the sea. Synonyms: dike, dyke.

(noun) a metric unit of length equal to ten meters. Synonyms: decameter, dekameter, decametre, dekametre, dkm.

(noun) female parent of an animal especially domestic livestock.

(verb) obstruct with, or as if with, a dam. Synonyms: dam up. Example: "Dam the gorges of the yangtse river."