(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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UK and Irish slang — Cockney, Scouse, Geordie, Yorkshire, Glaswegian, Brummie, Welsh, West Country, plus Irish English. Centuries of regional dialects feeding into modern British and Irish street talk.
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