1. a small, slender, often pointed piece of wood, metal, etc., used to fasten, support, or attach things.
2. a short, slender piece of wire with a point at one end and a head at the other, for fastening things together.
3. any of various forms of fasteners or ornaments consisting essentially or partly of a pointed or penetrating wire or shaft (often used in combination): a jeweled pin.
4. a badge having a pointed bar or pin attached, by which it is fastened to the clothing: a fraternity pin.
5. a photo or link that is bookmarked on Pinterest, a website and mobile application: She added 5 pins to her recipes board.
6. Machinery.
• a short metal rod, as a linchpin, driven through holes in adjacent parts, as a hub and an axle, to keep the parts together.
• a short cylindrical rod or tube, as a wrist pin or crankpin, joining two parts so as to permit them to move in one plane relative to each other.
• a short axle, as one on which a pulley rotates in a block.
7. the part of a cylindrical key stem entering a lock.
8. a clothespin.
9. a hairpin.
10. rolling pin.
11. a peg, nail, or stud marking the center of a target.
12. any one of the rounded wooden clubs set up as the target in tenpins, ninepins, duckpins, etc.
13. the flag staff which identifies a hole.
14. any of the projecting knobs or rails on a pinball machine that serve as targets for the ball.
15. a human leg.
16. peg (def. 5).
17. a fall.
18. Nautical.
• an axle for a sheave of a block.
• belaying pin.
19. a tenon in a dovetail joint; dovetail.
20. a very small amount; a trifle: Such insincere advice isn't worth a pin.
21. the immobilization of an enemy piece by attacking with one's queen, rook, or bishop.
22. a pin-shaped connection, as the terminals on the base of an electron tube or the connections on an integrated circuit.

23. to fasten or attach with or as with a pin or pins: to pin two pieces of cloth together.
24. to hold fast in a spot or position (sometimes followed by down): The debris pinned him down.
25. to transfix or mount with a pin or the like: to pin a flower as a botanical specimen.
26. to immobilize (an enemy piece) by placing one's queen, rook, or bishop in a position to check the exposed king or capture a valuable piece if the pinned piece were moved.
27. to secure a fall over one's opponent.
28. Digital Technology.
• to bookmark (a photo or link) on Pinterest, a website and mobile application: He pinned a jacket from Macy's on his fashion board.
• to fix (a social media post) to the top of a feed: She pinned a tweet about her forthcoming book to the top of her Twitter feed.

29. to bookmark a photo or link on Pinterest: I've been pinning a lot lately.

30. pin down,
• to bind or hold to a course of action, a promise, etc.
• to force (someone) to deal with a situation or to come to a decision: We tried to pin him down for a definite answer, but he was too evasive for us.
31. to fill (gaps in a rubble wall, etc.) with spalls.
32. to make (a piece of masonry) level or plumb with wedges.

33. get pinned,
• (of a young woman) to receive a male student's fraternity pin as a symbol of his affection and fidelity, usually symbolizing that the couple is going steady or plans to become engaged.
• (of a young couple) to become formally pledged to one another, though not yet engaged, by the bestowing of such a pin or the exchange of pins.
34. to ascribe the blame or guilt for something to a person; show someone to be culpable: They pinned the crime on him.
35. to end a relationship, project, program, or the like, because of lack of continuing interest, success, funds, etc.

1. a number assigned to an individual, used to establish identity in order to gain access to a computer system via an automatic teller machine, a point-of-sale terminal, or other device.

• a short stiff straight piece of wire pointed at one end and either rounded or having a flattened head at the other: used mainly for fastening pieces of cloth, paper, etc, esp temporarily
• (in combination)
2. short for cotter pin, hairpin, panel pin, rolling pin, safety pin
3. an ornamental brooch, esp a narrow one
4. a badge worn fastened to the clothing by a pin
5. something of little or no importance (esp in the phrases not care or give a pin (for))
6. a peg or dowel
7. anything resembling a pin in shape, function, etc
8. (in various bowling games) a usually club-shaped wooden object set up in groups as a target
9. a clip on a hand grenade that prevents its detonation until removed or released
10. nautical
• See belaying pin
• the axle of a sheave
• the sliding closure for a shackle
11. a metal tuning peg on a piano, the end of which is inserted into a detachable key by means of which it is turned
12. a metal rod, esp of stainless steel, for holding together adjacent ends of fractured bones during healing
13. a position in which a piece is pinned against a more valuable piece or the king
14. the flagpole marking the hole on a green
• the cylindrical part of a key that enters a lock
• the cylindrical part of a lock where this part of the key fits
16. a position in which a person is held tight or immobile, esp with both shoulders touching the ground
17. a dovetail tenon used to make a dovetail joint
18. (in Britain) a miniature beer cask containing 4 1/2 gallons
19. a leg
20. to be forced to make an extreme effort

21. to attach, hold, or fasten with or as if with a pin or pins
22. to transfix with a pin, spear, etc
23. to place (the blame for something)
24. to cause (an enemy piece) to be effectively immobilized by attacking it with a queen, rook, or bishop so that moving it would reveal a check or expose a more valuable piece to capture
25. to support (masonry), as by driving in wedges over a beam

1. p-type, intrinsic, n-type: a form of construction of semiconductor devices

1. personal identification number: a number used by a holder of a cash card or credit card used in EFTPOS

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