knuckle down

== English == === Etymology === 1864 in American English, from the game of marbles. === Pronunciation === === Verb === knuckle down (third-person singular simple present knuckles down, present participle knuckling down, simple past and past participle knuckled down) (intransitive, idiomatic) To get to work; to focus on a task. You should knuckle down and do your homework! To submit; knuckle under. ==== Synonyms ==== (get to work): belly up to the bar, get one's act together, pull up one's socks, roll up one's sleeves, shape up ==== Translations ==== ==== See also ==== hunker down buckle down