A tack is a small, sharp pin or nail with a wide head. You can use tacks to attach your flyers to the telephone poles in your neighborhood.

As a verb, tack means "attach using a tack," and also, simply "add," the way a movie director sometimes tacks on a happy ending to satisfy the audience. In sailing, a tack is a change of course that results in the wind blowing on the opposite side of the boat: "We decided to make a sharp tack to avoid the iceberg." Tack can also refer to a certain rope used in sailing, or to horseback riding equipment.

Definitions of tack
  1. noun
    a short nail with a sharp point and a large head
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    carpet tack
    used to nail down carpets
    drawing pin, pushpin, thumbtack
    a tack for attaching papers to a bulletin board or drawing board
    tack or small nail of tinned iron
    type of:
    a thin pointed piece of metal that is hammered into materials as a fastener
  2. verb
    fix to; attach
    synonyms: append, hang on, tack on, tag on
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    add to the end
    type of:
    cause to be attached
  3. verb
    fasten with tacks
    tack the notice on the board”
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    fasten with thumbtacks
    type of:
    fasten, fix, secure
    cause to be firmly attached
  4. verb
    create by putting components or members together
    “He tacked together some verses”
    synonyms: assemble, piece, put together, set up, tack together
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    break apart, break up, disassemble, dismantle, take apart
    take apart into its constituent pieces
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    comfit, confect, confection
    make into a confection
    confuse, jumble, mix up
    assemble without order or sense
    assemble once again, after taking something apart
    set up for a particular purpose
    create by mixing or combining
    rig up
    erect or construct, especially as a temporary measure
    addle, muddle, puddle
    mix up or confuse
    type of:
    bring together, join
    cause to become joined or linked
    create, make
    make or cause to be or to become
  5. noun
    the heading or position of a vessel relative to the trim of its sails
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    type of:
    aim, bearing, heading
    the direction or path along which something moves or along which it lies
  6. noun
    (nautical) the act of changing tack
    synonyms: tacking
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    type of:
    change of course
    a change in the direction that you are moving
  7. noun
    sailing a zigzag course
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    type of:
    riding in a sailboat
  8. noun
    (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind
    synonyms: mainsheet, sheet, shroud, weather sheet
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    futtock shroud
    shroud that is part of a ship's rigging
    type of:
    something (as a cord or rope) that is long and thin and flexible
  9. verb
    turn into the wind
    “The sailors decided to tack the boat”
    “The boat tacked
    synonyms: wear round
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    type of:
    travel on water propelled by wind
  10. verb
    reverse (a direction, attitude, or course of action)
    synonyms: alternate, flip, flip-flop, interchange, switch
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    type of:
    change by reversal, reverse, turn
    change to the contrary
  11. noun
    gear for a horse
    synonyms: saddlery, stable gear
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    piece of metal held in horse's mouth by reins and used to control the horse while riding
    caparison, housing, trapping
    stable gear consisting of a decorated covering for a horse, especially (formerly) for a warhorse
    cinch, girth
    stable gear consisting of a band around a horse's belly that holds the saddle in place
    stable gear consisting of either of two curved supports that are attached to the collar of a draft horse and that hold the traces
    stable gear consisting of an arrangement of leather straps fitted to a draft animal so that it can be attached to and pull a cart
    stable gear consisting of any part of a harness that fits about the horse's head
    a harness strap that connects the nose piece to the girth; prevents the horse from throwing back its head
    horse blanket, saddle blanket, saddlecloth
    stable gear consisting of a blanket placed under the saddle
    stable gear that joins two draft animals at the neck so they can work together as a team
    a saddle blanket made of buffalo hide
    bar bit
    a bit for horses that is a solid bar of metal
    an ornamental caparison for a horse
    headgear for a horse; includes a headstall and bit and reins to give the rider or driver control
    a bit resembling a snaffle bit; used with a separate curb
    curb, curb bit
    a horse's bit with an attached chain or strap to check the horse
    hackamore, halter
    rope or canvas headgear for a horse, with a rope for leading
    a cloth for the trapping of a horse
    a bit with a bar mouthpiece that is designed to combine a curb and snaffle
    snaffle, snaffle bit
    a simple jointed bit for a horse; without a curb
    type of:
    appurtenance, gear, paraphernalia
    equipment consisting of miscellaneous articles needed for a particular operation or sport etc.
  12. verb
    sew together loosely, with large stitches
    synonyms: baste
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    type of:
    run up, sew, sew together, stitch
    fasten by sewing; do needlework
Word Family

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