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."