(UK) To be too frightening or upsetting to even contemplate.
If the train had come just five seconds earlier... well, it just does'''n't bear thinking about'''!
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.