A pin is a small, sharp device that's made for attaching and holding things together. When you sew a shirt, you first have to pin the paper pattern to the fabric with pins.

Pins used for tacking paper to a bulletin board are made of sharp metal. A piece of jewelry that fastens to your shirt is also a pin. There are numerous other pins, from the pegs a guitar's strings are attached to; to the wooden pins you try to knock down when you're bowling; to the pins that hold your hairdo in place. And when you pin, you secure with a pin, or you hold someone down while wrestling.

Definitions of pin
  1. noun
    a small slender (often pointed) piece of wood or metal used to support or fasten or attach things
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    a small clip or pin for holding hair in place
    bitt pin
    a pin through the bitthead to keep the mooring lines from slipping off
    a double pronged pin used to hold women's hair in place
    a long sturdy pin used by women to secure a hat to their hair
    linchpin, lynchpin
    pin inserted through an axletree to hold a wheel on
    nog, peg
    a wooden pin pushed or driven into a surface
    heavy pin having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together
    safety pin
    a pin in the form of a clasp; has a guard so the point of the pin will not stick the user
    a long pin for holding meat in position while it is being roasted
    straight pin
    pin consisting of a short straight stiff piece of wire with a pointed end; used to fasten pieces of cloth or paper together
    gudgeon pin, wrist pin
    pin joining a piston to a connecting rod
    bobby pin, grip, hairgrip
    a flat wire hairpin whose prongs press tightly together; used to hold bobbed hair in place
    formerly a long hairpin; usually with an ornamental head
    a skewer for holding meat over a fire
    golf tee, tee
    a short peg put into the ground to hold a golf ball off the ground
    tent peg
    a peg driven into the ground to hold a rope supporting a tent
    treenail, trenail, trunnel
    a wooden peg that is used to fasten timbers in shipbuilding; water causes the peg to swell and hold the timbers fast
    type of:
    fastener, fastening, fixing, holdfast
    restraint that attaches to something or holds something in place
  2. noun
    small markers inserted into a surface to mark scores or define locations etc.
    synonyms: peg
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    type of:
    insignia, mark, marker, marking
    a distinguishing symbol
  3. noun
    flagpole used to mark the position of the hole on a golf green
    synonyms: flag
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    type of:
    golf equipment
    sports equipment used in playing golf
  4. noun
    a piece of jewelry that is pinned onto the wearer's garment
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    breastpin, broach, brooch
    a decorative pin worn by women
    scatter pin
    small pin usually worn in groups of two or more
    a decorative pin that is worn in a necktie
    scarfpin, tie tack, tiepin
    a pin used to hold the tie in place
    a jeweled brooch with a pattern resembling the sun
    type of:
    jewellery, jewelry
    an adornment (as a bracelet or ring or necklace) made of precious metals and set with gems (or imitation gems)
  5. verb
    attach or fasten with pins or as if with pins
    “" pin the needle to the shirt". "pin the blame on the innocent man”
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    remove the pins from; unfasten the pins of
    type of:
    fasten, fix, secure
    cause to be firmly attached
  6. verb
    pierce with a pin
    pin down the butterfly”
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    skewer, spit
    drive a skewer through
    type of:
    empale, impale, spike, transfix
    pierce with a sharp stake or point
  7. verb
    immobilize a piece
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    type of:
    aggress, attack
    take the initiative and go on the offensive
  8. verb
    to hold fast or prevent from moving
    “The child was pinned under the fallen tree”
    synonyms: immobilise, immobilize, trap
  9. noun
    when a wrestler's shoulders are forced to the mat
    synonyms: fall
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    (amateur wrestling) being brought to the mat from a standing position
    type of:
    triumph, victory
    a successful ending of a struggle or contest
  10. noun
    axis consisting of a short shaft that supports something that turns
    synonyms: pivot
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    the pivot about which a lever turns
    a pin or bolt forming the pivot of a hinge
    type of:
    axis, axis of rotation
    the center around which something rotates
  11. noun
    a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing
    synonyms: oarlock, peg, rowlock, thole, tholepin
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    type of:
    a holding device
  12. 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
    synonyms: pin tumbler
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    type of:
    a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown
  13. noun
    informal terms for the leg
    synonyms: peg, stick
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    type of:
    a human limb; commonly used to refer to a whole limb but technically only the part of the limb between the knee and ankle
  14. noun
    a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target
    synonyms: bowling pin
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    a bowling pin that is thin by comparison with a tenpin
    a bowling pin that is short and squat by comparison with a tenpin
    headpin, kingpin
    the front bowling pin in the triangular arrangement of ten pins
    ninepin, skittle, skittle pin
    a bowling pin of the type used in playing ninepins or (in England) skittles
    one of the bottle-shaped pins used in bowling
    type of:
    bowling equipment
    equipment used in bowling
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