The difference between Buckle down and Hunker down
When used as verbs, buckle down means to put forth the needed effort, whereas hunker down means to take shelter.
check bellow for the other definitions of Buckle down and Hunker down
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Buckle down as a verb (idiomatic):
To put forth the needed effort; to focus; become serious; apply oneself (e.g. to work or study).
Examples:
"If he would buckle down and do his homework, he could be an excellent student."
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Hunker down as a verb (idiomatic):
To take shelter; to prepare oneself for some eventuality; to focus on a task.
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Hunker down as a verb (idiomatic):
To stubbornly hold to a position.