buckle down
From Longman Dictionary of Contemporary Englishbuckle down phrasal verbWORK HARDto start working very hard to You’d better buckle down to some revision now. → buckle→ See Verb tableExamples from the Corpusbuckle to• They have not buckled down to the determination to fight this war through.• If individuals are forced to face the reality of starvation, everyone will buckle down to work.