Definitions:
a thin piece of metal with a sharp point at one end and a round head at the other, used for fastening pieces of cloth, paper, etc.

a metal projection from a plug or an integrated circuit which makes an electrical connection with a socket or another part of a circuit

a stick with a flag placed in a hole to mark its position.

a skittle in bowling.

a person's legs

an attack on a piece or pawn which is thereby pinned.

a half-firkin cask for beer.

attach or fasten with a pin or pins

hold (someone) firmly in a specified position so they are unable to move

hinder or prevent (a piece or pawn) from moving because of the danger to a more valuable piece standing behind it along the line of an attack

an identifying number allocated to an individual by a bank or other organization and used for validating electronic transactions.