The Collaborative International Dictionary of English v.0.48:

Gird \Gird\ (g[~e]rd), v. t. [imp. & p. p. Girtor Girded; p.
   pr. & vb. n. Girding.] [OE. girden, gurden, AS. gyrdan;
   akin to OS. gurdian, D. gorden, OHG. gurten, G. g["u]rten,
   Icel. gyr[eth]a, Sw. gjorda, Dan. giorde, Goth. biga['i]rdan
   to begird, and prob. to E. yard an inclosure. Cf. Girth, n.
   & v., Girt, v. t.]
   1. To encircle or bind with any flexible band.
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   2. To make fast, as clothing, by binding with a cord, girdle,
      bandage, etc.
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   3. To surround; to encircle, or encompass.
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            That Nyseian isle,
            Girt with the River Triton.           --Milton.
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   4. To clothe; to swathe; to invest.
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            I girded thee about with fine linen.  --Ezek. xvi.
                                                  10.
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            The Son . . . appeared
            Girt with omnipotence.                --Milton.
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   5. To prepare; to make ready; to equip; as, to gird one's
      self for a contest.
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            Thou hast girded me with strength.    --Ps. xviii.
                                                  39.
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   To gird on, to put on; to fasten around or to one securely,
      like a girdle; as, to gird on armor or a sword.
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            Let not him that girdeth on his harness boast
            himself as he that putteth it off.    --1 Kings xx.
                                                  11.

   To gird up, to bind tightly with a girdle; to support and
      strengthen, as with a girdle.
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            He girded up his loins, and ran before Ahab. --1
                                                  Kings xviii.
                                                  46.
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            Gird up the loins of your mind.       --1 Pet. i.
                                                  13.

   Girt up; prepared or equipped, as for a journey or for
      work, in allusion to the ancient custom of gathering the
      long flowing garments into the girdle and tightening it
      before any exertion; hence, adjectively, eagerly or
      constantly active; strenuous; striving. "A severer, more
      girt-up way of living." --J. C. Shairp.
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The Collaborative International Dictionary of English v.0.48:

Girding \Gird"ing\, n.
   That with which one is girded; a girdle.
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         Instead of a stomacher, a girding of sackcloth. --Is.
                                                  iii. 24.
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