Bermuda Trianglenoun [ S ]
uk/bəˌmjuː.də ˈtraɪ.æŋ.ɡəl//bɚˌmjuː.də ˈtraɪ.æŋ.ɡəl/an area in the western part of the North Atlantic Ocean where ships and aircraft are said to have disappeared in mysterious ways
also Bermuda triangle a place or activity in which things often disappear or go wrong:
She described civil unions as the Bermuda Triangle of relationships.
Preferring old-fashioned operettas, France has always been a Bermuda triangle for musicals.