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pin

 
/pɪn/ n [C] (FASTENER)

Definition

a thin piece of stiff wire with a pointed end that you can stick through two things to fasten them together: Mary put a pin in her hair to hold her hat on. A pin can also be decorative and used as jewelry: She wore a beautiful gold pin on her coat.
(Definition of pin n (FASTENER) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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