Definition of bolt adverb from the Oxford Advanced Learner's Dictionary

 

bolt

 adverb
adverb
BrE BrE//bəʊlt//
 
; NAmE NAmE//boʊlt//
 
 
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Idioms
sit/stand bolt upright
 
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to sit or stand with your back straight See related entries: Position and movement
See the Oxford Advanced American Dictionary entry: bolt