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
After our conversation about the expression dingle day, a term used by workers at a research station in Antarctica to denote bright, sunny weather, a listener offers a possible explanation for this term. It may derive from the idea of the skies...
Ribbon fall. Gallery forest. You won’t find terms like these in most dictionaries, but they and hundreds like them are discussed by famous writers in the book Home Ground: A Guide to the American Landscape. The book is an intriguing collection...