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Reason for some hisses (9 letter answer)

The Answer




The answer DEFLATION is so rare that it appears less than once every 2500 puzzles.


DEFLATION as a noun:

1. (geology) the erosion of soil as a consequence of sand and dust and loose rocks being removed by the wind; "a constant deflation of the desert landscape"
2. a contraction of economic activity resulting in a decline of prices
3. the act of letting the air out of something