Meaning of “buckle down” in the English Dictionary

american-english dictionary

"buckle down" in American English

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buckle down

phrasal verb with buckle us /ˈbʌk·əl/ verb [ I/T ]

to start working hard:

He’ll have to buckle down if he expects to pass the course.

(Definition of “buckle down” from the Cambridge Academic Content Dictionary © Cambridge University Press)