Meaning of “bolt upright” in the English Dictionary

american-english dictionary

"bolt upright" in British English

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bolt uprightadverb

uk /ˌbəʊlt ˈʌp.raɪt/ us /ˌboʊlt ˈʌp.raɪt/

vertical and very straight:

Suddenly she sat bolt upright as if something had startled her.

(Definition of “bolt upright” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"bolt upright" in American English

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bolt upright

vertical and extremely straight:

She woke up and sat bolt upright in bed, terrified by her dream.

(Definition of “bolt upright” from the Cambridge Academic Content Dictionary © Cambridge University Press)