knuckle down Informal
Meaning: If you knuckle down, you start to take your work or your task seriously and do it properly.
- knuckle down The exams start next month, so I guess it's time I knuckled down and studied a bit harder.
- knuckle down If Sammy wants to lose weight, he'll have to knuckle down and start exercising more at the gym.
It's time we knuckled down and