To dig down

to undermine and cause to fall by digging; as, to dig down a wall.

See also: Dig

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in classic literature ?
We have, therefore, a well of sixty feet in diameter to dig down to a depth of nine hundred feet.
When a city is buried thirty or forty feet deep beneath earth and great trees have grown over it, it is not easy to dig down to it."
Most plants need a root depth of 15-20cm, so it is best to dig down at least this far, though you'll want to dig to around 30cm deep if growing root vegetables.
So, instead of using a hoe, take a trowel or a specialist weed tool to dig down and pull out the weeds by the roots.
"We had to dig down, and they had to be at the basement level anyway.
Keep | planting bulbs for next spring - try easy ones like chionodoxa and crocus - easy because you don't have to dig down far.
Mark said: "They say they will have to dig down under the house once the house has been cleaned to find what will be left under the floorboards and everything up to a metre down because of contamination.
The soil will have no goodness left, so you'd have to dig down and around at least a couple of feet, get rid of all that soil and replace it with a top soil/compost mixture.
Whereas in the past, workers would have to dig down and drill into the pipe to measure the corrosion to determine how much of the pipe is in working order, now White Rock Consultants will use the resulting data to assess areas of weakness and clear out debris that causes problems.
"I really had to dig down deep and think hard about what was right for me, what was right for my family.
We only had to dig down a couple of feet and we came across some coins.
Because the item might be refuse from a previously undocumented expedition, the researchers haven't yet decided whether to dig down to it.