The Collaborative International Dictionary of English v.0.48:

Numb \Numb\, v. t. [imp. & p. p. Numbed (n[u^]md); p. pr. &
   vb. n. Numbing (n[u^]m"[i^]ng).]
   To make numb; to deprive of the power of sensation or motion;
   to render senseless or inert; to deaden; to benumb; to
   stupefy.
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         For lazy winter numbs the laboring hand. --Dryden.
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         Like dull narcotics, numbing pain.       --Tennyson.
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