Where does this definition of knuckle ball come from?
This entry for knuckle ball is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Is knuckle ball a noun, verb, or something else?
In this entry, knuckle ball is tagged as 2n..
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.