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The location of B supergiants in the Hertzsprung-Russell diagram (HRD)represents a long-standing problem in massive star evolution. Here we proposetheir nature may be revealed utilising their rotational properties, and wehighlight a steep drop in massive star rotation rates at an effectivetemperature of 22000 K. We discuss two potential explanations for it. On theone hand, the feature might be due to the end of the main sequence, which couldpotentially constrain the core overshooting parameter. On the other hand, thefeature might be the result of enhanced mass loss at the predicted location ofthe bi-stability jump. We term this effect "bi-stability breaking" and discussits potential consequences for the evolution of massive stars.

The nature of B supergiants: clues from a steep drop in rotation rates at 22000 K. The possibility of Bi-stability braking