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noun a small thin piece of metal with a sharp point at one end and a round head at the other, used especially for fastening pieces of cloth

preposition used to indicate the act of attaching or fastening something to something else

• She carefully pinned on her name badge before entering the conference.
• I always forget to pin on my keys before leaving the house.
• I need to pin on my game face for this presentation.
• He tried to pin on the blame on someone else.