máknout na čem, opřít se do čeho, pustit se do něčeho
He'll have to buckle down (to his work) soon if he wants to pass these exams.CIDI
I told her that it was time that she buckled down and began to work harder than before. IC
The first afternoon of the course, we did nothing, as the participants all had to buckle down and clean out the premises, including the lavatories and the windows. BNC-B