Where does this definition of bolt upright come from?
This entry for bolt upright is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Is bolt upright a noun, verb, or something else?
In this entry, bolt upright is tagged as 2adv..
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.