To work hard; exert oneself to get or do something; strive
(Intransitive, idiomatic) To begin working.
work very hard, like a slave
Find another word for knuckle-down. In this page you can discover 9 synonyms, antonyms, idiomatic expressions, and related words for knuckle-down, like: apply-oneself, try-hard, labor, set-to-work, concentrate, work, slave, break one's back and buckle down.