Definition of bolt upright in English:

bolt upright

With the back very straight: she sat bolt upright in bed
More example sentences
  • Sarah suddenly sat bolt upright in bed, sweat pouring down her forehead.
  • She woke up with a sudden start and sat bolt upright in bed.
  • My mother sat angrily bolt upright while they read Grandpa's will.
Synonyms
straight, rigidly, stiffly, completely upright
See parent entry: bolt

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Pronunciation: ˈbəʊɡ(ə)l
noun
a phantom or goblin