Definition of "Pin" :
noun: a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target
noun: a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing
noun: a small slender (often pointed) piece of wood or metal used to support or fasten or attach things
noun: a piece of jewelry that is pinned onto the wearer's garment
noun: flagpole used to mark the position of the hole on a golf green
noun: cylindrical tumblers consisting of two parts that are held in place by springs; when they are aligned with a key the bolt can be thrown
noun: axis consisting of a short shaft that supports something that turns
noun: informal terms for the leg
noun: a number you choose and use to gain access to various accounts
noun: small markers inserted into a surface to mark scores or define locations etc.
noun: when a wrestler's shoulders are forced to the mat
verb: (chess) immobilize a piece
verb: to hold fast or prevent from moving
"The child was pinned under the fallen tree."
verb: attach or fasten with pins
"Pin the needle to the shirt."
verb: pierce with a pin
"Pin down the butterfly."