Buckle
/bˈʌkəl/
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Definition
(noun) A metal clasp with a hinged tongue or a spike through which a belt or strap is passed and penetrated by the tongue or spike, in order to fasten the ends of the belt together or to secure the strap to something else.
Sentence Examples
I've really got to buckle down and study for our final exams.
On base and off, buckle your seat-belts.
CEFR Practice Quiz
He fastened the silver ____ on his leather belt before leaving today.