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.
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   2. To fasten or bind with a strap. --Cowper.
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   3. To sharpen by rubbing on a strap, or strop; as, to strap a
      razor.
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The Collaborative International Dictionary of English v.0.48:

Strapping \Strap"ping\, a.
   Tall; strong; lusty; large; as, a strapping fellow. [Colloq.]
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         There are five and thirty strapping officers gone.
                                                  --Farquhar.
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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]