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(as) busy as a beaver (building a new dam)

Very busy, assiduous, or hardworking. The phrase refers to beavers' reputation for being extremely industrious. Between working two part-time jobs, volunteering on the weekends, and looking after his little brother, Sam's been busy as a beaver this summer. I've been as busy as a beaver building a new dam this year. I've had almost no free time!
See also: beaver, busy, new

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 periodicals archive ?
Condor Water and Light Company, constructed a replacement dam on the
constructed concrete gravity dam, (340) which retained the name Gold Ray
Eventually, Condor Water and Light Company sold the Gold Ray Dam to the
California-Oregon Power Company, which later sold the dam to PacifiCorp.
In 1972, PacifiCorp abandoned the Gold Ray Dam, allowing ownership
Eyvashan dam in Lorestan is of soil-rock fill dam with clay core.
In time of dam break for this scenario, a flood with peak flow rate of 12000 cubic meters per second was transferred to downstream.
Downstream lands which include a range of villages will have different water depth upon inlet of water volume in result of dam break.
If Eyvashan dam break occurs due to natural factors, 4895 people will be in danger of dam break flood.
If Eyvashan dam break in Lorestan occurs due to flood with 10000 years return period, 7130 people will be in danger of this flood.
Craver said Nature's Classroom, the caretaker of the dam in Charlton at Prindle Lake for owners The Santos Irrevocable Trust, was faced with a decision of whether to breach the dam and drain the lake or pay for repairs.
The dam holds back an 80-acre lake with more than 80 camps and homes on it.
The dam was saved through a relatively unusual agreement.
One of the most recent Worcester County dam repair projects was mostly completed in September in North Brookfield.
Jones said the dam was not in imminent danger of failing, but was listed in Mr.