Source : Webster's Revised Unabridged Dictionary (1913)

Strut \Strut\, v. t. [imp. & p. p. {Strutted}; p. pr. & vb. n.
   {Strutting}.] [OE. struten, strouten, to swell; akin to G.
   strozen to be swelled, to be puffed up, to strut, Dan.
   strutte.]
   1. To swell; to bulge out. [R.]

            The bellying canvas strutted with the gale.
                                                  --Dryden.

   2. To walk with a lofty, proud gait, and erect head; to walk
      with affected dignity.

            Does he not hold up his head, . . . and strut in his
            gait?                                 --Shak.

Strut \Strut\, n. [For senses 2 & 3 cf. LG. strutt rigid.]
   1. The act of strutting; a pompous step or walk.

   2. (Arch.) In general, any piece of a frame which resists
      thrust or pressure in the direction of its own length. See
      {Brace}, and Illust. of {Frame}, and {Roof}.

   3. (Engin.) Any part of a machine or structure, of which the
      principal function is to hold things apart; a brace
      subjected to compressive stress; -- the opposite of stay,
      and tie.

Strut \Strut\, v. t.
   To hold apart. Cf. {Strut}, n., 3.

Strut \Strut\, a.
   Protuberant. [Obs.] --Holland.

Source : WordNet®

strut
     n 1: a proud stiff pompous gait [syn: {prance}, {swagger}]
     2: brace consisting of a bar or rod used to resist longitudinal
        compression
     v : to walk with a lofty proud gait, often in an attempt to
         impress others; "He struts around like a rooster in a hen
         house" [syn: {swagger}, {ruffle}, {prance}, {sashay}, {cock}]
     [also: {strutting}, {strutted}]