The Collaborative International Dictionary of English v.0.48:

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.]
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            The bellying canvas strutted with the gale.
                                                  --Dryden.
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   2. To walk with a lofty, proud gait, and erect head; to walk
      with affected dignity.
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            Does he not hold up his head, . . . and strut in his
            gait?                                 --Shak.
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The Collaborative International Dictionary of English v.0.48:

Strutting \Strut"ting\,
   a. & n. from Strut, v. -- Strut"ting*ly, adv.
   [1913 Webster]