Definition of pin noun from the Oxford Advanced American Dictionary

      

    pin

     noun
    noun
    NAmE//pɪn//
     
     
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    for fastening/joining
  1. 1 a short thin piece of stiff wire with a sharp point at one end and a round head at the other, used especially for fastening together pieces of cloth when sewing see also bobby pin, hairpin, hatpin, linchpin, pins and needles, safety pin
  2. jewelry
  3. 2a piece of jewelry with a pin on the back of it, that can be fastened to your clothes synonym brooch
  4. 3 a short thin piece of stiff wire with a sharp point at one end and an item of decoration at the other, worn as jewelry a diamond pin
  5. badge
  6. 4 a type of badge that is fastened with a pin at the back He supports the group and wears its pin on his lapel.
  7. medical
  8. 5a piece of steel used to support a bone in your body when it has been broken The pin in her spine will have to be changed as she grows.
  9. electrical
  10. 6one of the metal parts that stick out of an electric plug a 2-pin plug
  11. in games
  12. 7a wooden or plastic object that is shaped like a bottle and that players try to knock down in games such as bowling
  13. in golf
  14. 8a stick with a flag on top of it, placed in a hole so that players can see where they are aiming for The ball stopped five feet short of the pin.
  15. legs
  16. 9 pins [plural] (informal) a person's legs He's not as quick on his pins as he used to be.
  17. on small bomb
  18. 10a small piece of metal on a hand grenade that stops it from exploding and is pulled out just before the hand grenade is thrown
  19. Idioms
    you could hear a pin drop
     
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    it was extremely quiet The audience was so quiet you could have heard a pin drop.
See the Oxford Advanced Learner's Dictionary entry: pin