third-person singular simple present indicative form of knuckle down.

listen to the pronunciation of third-person singular simple present indicative form of knuckle down.
Английский Язык - Английский Язык

Определение third-person singular simple present indicative form of knuckle down. в Английский Язык Английский Язык словарь

Third-person singular simple present indicative form of knuckle down.
knuckles down