The Collaborative International Dictionary of English v.0.48:

Strap \Strap\, v. t. [imp. & p. p. Strapped; p. pr. & vb. n.
   Strapping.]
   1. To beat or chastise with a strap.
      [1913 Webster]

   2. To fasten or bind with a strap. --Cowper.
      [1913 Webster]

   3. To sharpen by rubbing on a strap, or strop; as, to strap a
      razor.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Strapping \Strap"ping\, a.
   Tall; strong; lusty; large; as, a strapping fellow. [Colloq.]
   [1913 Webster]

         There are five and thirty strapping officers gone.
                                                  --Farquhar.
   [1913 Webster]

WordNet (r) 3.0 (2006):

strapping
    adj 1: muscular and heavily built; "a beefy wrestler"; "had a
           tall burly frame"; "clothing sizes for husky boys"; "a
           strapping boy of eighteen"; "`buirdly' is a Scottish
           term" [syn: beefy, burly, husky, strapping,
           buirdly]

Moby Thesaurus II by Grady Ward, 1.0:

112 Moby Thesaurus words for "strapping":
   adipose, bastinado, basting, battery, beating, beefy, belting,
   big-bellied, bloated, blowzy, bosomy, bouncing, brawny, buffeting,
   burly, buxom, caning, chubby, chunky, clubbing,
   corporal punishment, corpulent, cowhiding, cudgeling, distended,
   doughty, drubbing, dumpy, fat, fattish, flagellation, flailing,
   fleshy, flogging, forceful, forcible, forcy, full, full-blooded,
   full-strength, fustigation, gross, gutsy, gutty, hale, hard,
   hard as nails, hardy, hearty, heavyset, hefty, hippy,
   horsewhipping, husky, imposing, iron-hard, lacing, lashing, lusty,
   meaty, mighty, nervy, obese, obstinate, overweight, paunchy,
   pistol-whipping, plump, podgy, portly, potbellied, potent,
   powerful, pudgy, puffy, puissant, pursy, rawhiding, red-blooded,
   robust, robustious, roly-poly, rotund, rugged, scourging, spanking,
   square, squat, squatty, stalwart, steely, stocky, stout, stripes,
   strong, strong as brandy, strong as strong, strong-willed, sturdy,
   swingeing, switching, swollen, thick-bodied, thickset, thrashing,
   top-heavy, trouncing, truncheoning, tubby, vigorous, well-fed,
   whipping