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Wiktionary
buckle down

vb. (context idiomatic English) To put forth the needed effort; to focus; become serious; apply oneself (e.g. to work or study).

WordNet
buckle down

v. work very hard, like a slave [syn: slave, break one's back, knuckle down]

Usage examples of "buckle down".

What could a band of bureaucrats want, that would make them willing, even eager, to buckle down to the work of learning facts they had never known existed?