[1] : The Collaborative International Dictionary of English v.0.48

tack \tack\, n. oe. tak, takke, a fastening; akin to d. tak a
   branch, twig, g. zacke a twig, prong, spike, dan. takke a
   tack, spike; cf. also sw. tagg prickle, point, icel. t=ag a
   willow twig, ir. taca a peg, nail, fastening, gael. tacaid,
   armor.  corn. tach; perhaps akin to e. take. cf. attach,
   attack, detach, tag an end, zigzag.
   1. a small, short, sharp-pointed nail, usually having a
      broad, flat head.
      1913 webster

   2. that which is attached; a supplement; an appendix. see
      tack, v. t., 3. --macaulay.
      1913 webster

            some tacks had been made to money bills in king
            charles's time.                       --bp. burnet.
      1913 webster
      1913 webster

   3. naut.
      a a rope used to hold in place the foremost lower
          corners of the courses when the vessel is closehauled
          see illust. of ship; also, a rope employed to pull
          the lower corner of a studding sail to the boom.
      b the part of a sail to which the tack is usually
          fastened; the foremost lower corner of fore-and-aft
          sails, as of schooners see illust. of sail.
      c the direction of a vessel in regard to the trim of her
          sails; as, the starboard tack, or port tack; -- the
          former when she is closehauled with the wind on her
          starboard side; hence, the run of a vessel on one
          tack; also, a change of direction; as, to take a
          different tack; -- often used metaphorically.
          1913 webster

   4. scots law a contract by which the use of a thing is set,
      or let, for hire; a lease. --burrill.
      1913 webster

   5. confidence; reliance. prov. eng. --halliwell.
      1913 webster

   tack of a flag naut., a line spliced into the eye at the
      foot of the hoist for securing the flag to the halyards.
      

   tack pins naut., belaying pins; -- also called jack
      pins.

   to haul the tacks aboard naut., to set the courses.

   to hold tack, to last or hold out. --milton.
      1913 webster
see also:
attach attack detach tag zigzag tack 
ship sail tack of a flag tack pins jack pins 
to haul the tacks aboard to hold tack 

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Jack Up, definition of term: Jack Up
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Jack Plane, definition of term: Jack Plane
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Jack Tar, definition of term: Jack Tar
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Jack Off, definition of term: Jack Off
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Black Jack >> B Words
Black Jack, definition of term: Black Jack
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