Meaning of “pin” - Learner’s Dictionary

pin

noun [ C ] uk us /pɪn/
FOR CLOTH

B1 a thin piece of metal with a sharp point used to fasten pieces of cloth, etc together:

She pricked her finger on a pin.
FOR FASTENING

a thin piece of metal, wood, plastic, etc that holds or fastens things together:

He's had a metal pin put in his leg so that the bones heal properly.
→ See also drawing pin , pins and needles , rolling pin , safety pin

(Definition of “pin noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)