knuckle down
verb
Infinitive
knuckle down
Present tense 3rd person singular
knuckles down
Preterite
knuckled down
Present participle
knuckling down
Past participle
knuckled down
verb
knuckle down
knuckles down
knuckled down
knuckling down
knuckled down
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb
verb