Where does this definition of double up come from?
This entry for double up is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Is double up a noun, verb, or something else?
In this entry, double up is tagged as 2v..
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.