This entry for had best is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is had best a noun, verb, or something else?
In this entry, had best 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.