• set of numbers which identifies a person (usually in order to access certain services: i.e. at a bank, university, club, etc.)
• small needle; spike; prong, peg; metallic prong on a chip or electrical plug
• fasten with pins, attach with pins; stick, stab; confine, hold, immobilize
• a pin is a very small, thin, pointed piece of metal that is used to fasten pieces of cloth together.
• a pin is also an ornamental badge that you can wear on your clothes; used in american english.
• if you pin something somewhere, you fasten it there with a pin, a drawing pin, or a safety pin.
• if someone pins you in a particular position, they hold you down firmly so that you cannot move.
• if someone pins the blame for something on you, they say that you did it or caused it; an informal use.
• if you pin your hopes on something, you rely on it to be successful.
• if you try to pin down something which is hard to describe, you try to say exactly what it is or what it is like.
• if you pin someone down, you force them to make a definite statement.
• if you pin up a poster or a notice, you pin it to a wall.
• if you pin up part of a piece of clothing, you pin the bottom of it to a higher position.
• see also pin-up.
• fix firmly in place; confirm, determine; force into revealing the truth
• small expenses, pocket money
• pin money is a small amount of extra money that someone earns in order to buy things that they want but that they do not really need.
• beat flat, pound until flat
pin someone at an exam
• fail a test, receive a bad score on a test
pin someone's ears back
• (slang) overcome utterly, defeat a person; punish ...