tailspin - definition and synonyms

noun [singular] 

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  1. 1
    an occasion when a plane falls in the sky with its nose (=front part) downwards and its tail (=end part) spinning in a very wide circle

    The plane went into a tailspin.

  2. 2
    informal an occasion when something or someone suddenly gets into a very bad state

    The news sent the nation’s financial markets into a tailspin.