A tailspin is when an aircraft suddenly drops sharply downwards and spins out of control. It's also used figuratively to describe a situation that's going very badly.
When something or someone gets into a tailspin, it means they're moving rapidly downward and losing control. For example, if your favorite sports team loses its last few games and starts making silly mistakes, you could say their season is in a tailspin. This usually implies a loss of momentum, poor decision-making, or just plain bad luck that's getting worse by the minute.
The rapid, uncontrollable descent of an aircraft in a steep spiral.
Example: The loss of the third engine threw the plane into a tailspin.
Of an aircraft: to go into a rapid, uncontrollable descent in a steep spiral.
