tail ‧ spin /ˈteɪlˌspɪn/ BrE AmE noun [countable usually singular]
1 . in/into a tailspin in or into a bad situation that keeps getting worse in a way that you cannot control:
Raising interest rates could send the economy into a tailspin.
2 . when a plane falls through the air, with the front pointing downwards and the back spinning in a circle