dam

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Related to dammed: damned

dam something up

to erect a barrier in a river, stream, brook, etc. We are going to have to dam this stream up to make a pond for the cattle. Let's dam up this stream. Why is this river dammed up?
See also: dam, up

water over the dam

 and water under the bridge
Fig. past and unchangeable events. Your quarrel with Lena is water over the dam; now you ought to concentrate on getting along with her. George and I were friends once, but that's all water under the bridge now.
See also: dam, water

be water under the bridge

  (British, American & Australian) also be water over the dam (American)
if a problem or an unpleasant situation is water under the bridge, it happened a long time ago and no one is upset about it now We certainly had our disagreements in the past, but that's all water under the bridge now.
See of the first water, could talk under water, blow out of the water, hold water, test the water, tread water
See also: bridge, water

water over the dam

Also, water under the bridge. Something that is over and done with, especially an unfortunate occurrence. For example, Last year's problems with delivery are water over the dam, or Never mind that old quarrel; that's water under the bridge. These metaphoric phrases allude to water that has flowed over a spillway or under a bridge and thus is gone forever. The first term was first recorded in 1797; the variant dates from the late 1800s.
See also: dam, water
References in classic literature ?
The gutters of the street, and every crack and fissure in the stones, ran with scorching spirit, which being dammed up by busy hands, overflowed the road and pavement, and formed a great pool, into which the people dropped down dead by dozens.
Therefore, the annual worldwide total of sediment reaching the ocean on all rivers, dammed and undammed, is about 12.
THE FUTURE BE DAMMED For decades, for better or worse, people have been on a dam-building binge that would be the envy of any beaver.
Industry relies on the placid waters of the dammed river for shipping.
A dammed Pacuare will produce more than 400 megawatts of juice to help meet the developing country's needs.
2] isle formed when the Chagres River was dammed in 1913 to provide waters for the Panama Canal.