PIN

• pin [countable]
• 1

  for joining/fastening

• a) a short thin piece of metal with a sharp point at one end, used especially for fastening together pieces of cloth while making clothes
• b) a thin piece of metal used to fasten things together, especially broken bones
• 2

  jewellery

  American English a piece of metal, sometimes containing jewels, that you fasten to your clothes to wear as a decoration [= broochBritish English]
• 3

  electrical

  British English one of the pieces of metal that sticks out of an electric plug:
• a three-pin plug
• 
• 4

  bowling

  one of the bottle-shaped objects that you try to knock down in a game of bowling
• 5

   you could hear a pin drop

  spoken used to say that it is very quiet and no one is speaking
• 6

  part of bomb

  a short piece of metal which you pull out of a hand grenade to make it explode a short time later
• 7

  golf

  a metal stick with a flag at the top which marks the holes on a golf course
• 8

   for two pins I'd ...

  British English old-fashioned used to say that you would like to do something to someone because they have annoyed you:
• For two pins, I'd just send them all home.
• 9

   pins

   [plural] British English informal legs
• ➔ drawing pin, pin money, pins and needles (1), rolling pin, safety pin

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.