bolt upright vs upright

bolt upright

adj
  • vertical, with the back held stiffly 

upright

adj
  • Vertical; erect 

  • Greater in height than breadth. 

  • Of good morals; practicing ethical values. 

  • Having the head approximately at a right angle with the shaft. 

  • In its proper orientation; not overturned. 

adv
  • In or into an upright position. 

noun
  • An upright piano. 

  • An upright arcade game cabinet. 

  • A leg 

  • A word clued by the successive initial, middle, or final letters of the cross-lights in a double acrostic or triple acrostic. 

  • A goal post. 

  • Any vertical part of a structure. 

verb
  • To set upright or stand back up (something that has fallen). 

How often have the words bolt upright and upright occurred in a corpus of books? (source: Google Ngram Viewer )