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English definition of “pin”

pin

noun [C] (FASTENER)   /pɪn/
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 noun (FASTENER) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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