The noun pin has 11 senses (first 1 from tagged texts)
1. (1) pin -- (a piece of jewelry that is pinned onto the wearer's garment)
2. fall, pin -- (when a wrestler's shoulders are forced to the mat)
3. peg, pin -- (small markers inserted into a surface to mark scores or define locations etc.)
4. personal identification number, PIN, PIN number -- (a number you choose and use to gain access to various accounts)
5. pin, peg, stick -- (informal terms of the leg; "fever left him weak on his sticks")
6. pivot, pin -- (axis consisting of a short shaft that supports something that turns)
7. pin -- (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)
8. pin, flag -- (flagpole used to mark the position of the hole on a golf green)
9. pin -- (a small slender (often pointed) piece of wood or metal used to support or fasten or attach things)
10. peg, pin, thole, tholepin, rowlock, oarlock -- (a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing)
11. bowling pin, pin -- (a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target)
Overview of verb pin
The verb pin has 4 senses (first 2 from tagged texts)
1. (2) trap, pin, immobilize, immobilise -- (to hold fast or prevent from moving; "The child was pinned under the fallen tree")
2. (1) pin -- (attach or fasten with pins)
3. pin -- (pierce with a pin; "pin down the butterfly")