not bear thinking about

not bear thinking about

1. (UK) To be too frightening or upsetting to even contemplate.

   If the train had come just five seconds earlier... well, it just doesn't bear thinking about!

• “something doesn t bear thinking about” in Longman Dictionary of Contemporary English, Longman.
• “not bear thinking about” (US) / “not bear thinking about” (UK) in Macmillan English Dictionary.