tail·spin 
/ˈteɪlˌspɪn/ noun
/ˈteɪlˌspɪn/ noun [singular] 1 : a condition in which an airplane is falling rapidly while turning around and around
▪ The plane went into a tailspin. [=spin] 2 : a state in which something quickly becomes much worse
▪ Stock prices are in a tailspin. ▪ The team went into a tailspin and lost six straight games. ▪ The news of his death sent her into a tailspin. [=caused her to become very unhappy, to lose control of her life, etc.]
▪ The plane went into a tailspin. [=spin]
▪ Stock prices are in a tailspin. ▪ The team went into a tailspin and lost six straight games. ▪ The news of his death sent her into a tailspin. [=caused her to become very unhappy, to lose control of her life, etc.]
