sweet spot
n.— «Like the snowflakes that fall on the mountain, no two days are alike in the avalanche-control business.…The explosives come in two forms.…The method of delivery depends on the accessibility of the “sweet spots,” the places on a particular slope that the ski patrol knows from years of experience will effectively bring down most or all of a dangerous slab.» —“Blasting powder” by Brian Metzler Rocky Mountain News (Denver, Colorado) Feb. 25, 2008. (source: Double-Tongued Dictionary)
Further reading
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