dam
n 1: a barrier constructed to contain the flow or water or to
keep out the sea [syn: {dike}, {dyke}, {levee}]
2: a metric unit of length equal to ten meters [syn: {decameter},
{dekameter}, {decametre}, {dekametre}, {dkm}]
3: female parent of an animal especially domestic livestock
v : obstruct with, or as if with, a dam [syn: {dam up}]