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Three days after the earthquake, the chances of rescuing buried survivors were rapidly diminishing.
Supplies of the popular toy were diminishing, and the company did not plan to make any more.
My excitement will diminish.
The correct spelling is "diminish" (to make smaller or less).
Watering fresh cut flowers will diminish their demise. Or, Expenses diminish the return on investment.
As it became dark what I could see began to diminish