(n): a structure or object that impedes free movement
(n): a metric unit of length equal to ten meters
(n): a linear unit of distance in metric terms
(n): female parent of an animal especially domestic livestock
(n): an animal that produces gametes (ova) that can be fertilized by male gametes (spermatozoa)
(v): obstruct with, or as if with, a dam
(v): block passage through
You can't argue with a river, it is going to flow. You can dam it up, put it to useful purposes, deflect it, but you can't argue with it.
(Dean Gooderham Acheson)
Mad in reverse.