(intransitive, originally, US, idiomatic) To apply oneself to study, or a task or work; to focus on or take a serious attitude towards something; to put forth the needed effort.
If he would buckle down and do his homework, he could be an excellent student.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.