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English definition of “buckle”

buckle

noun [C]  /ˈbʌk·əl/ us  

buckle noun [C] (FASTENER)

a fastener for a belt: a silver buckle

buckle

verb [I/T]  /ˈbʌk·əl/ us  

buckle verb [I/T] (FASTEN)

to fasten or be fastened with a buckle: [T] Please buckle your seat belts.

buckle verb [I/T] (BEND)

to bend or become uneven, often as a result of force, heat, or weakness: [I] After eight hours of hiking, our knees were beginning to buckle. Someone who buckles or buckles under gives in to something, such as pressure or opposition: [I] The judge threatened her with jail, but she refused to buckle and would not say where she got the information.
Phrasal verbs
(Definition of buckle from the Cambridge Academic Content Dictionary © Cambridge University Press)
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