sinking spell

基本解释

Actually, the Index hit 2, 000 early in 2010, followed by a sinking spell in 2011 to below 1, 500, currently in a recovery phase again at 2, 000.
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Over cocktails at the Forbes Townhouse in New York the other day, the head of one of Europe's biggest insurance companies predicted that intervention might support the euro at about 88 U.S. cents for a spell, after which it would again start sinking, to 80 cents.
FORBES: Sidelines