B1
a small, thin piece of metal with a sharp point used for temporarily holding pieces of cloth together
Dictionary examples:
I dropped a box of pins. Now my floor is a dangerous adventure! (0.0)
I used so many pins on my Halloween costume, I became a human porcupine! (0.0)
My tailor uses so many pins, he looks like a walking cactus! (0.0)
I'll keep the patch in place on the jeans with pins while I sew it on. (55.5)