The Collaborative International Dictionary of English v.0.48:

Throb \Throb\, v. i. [imp. & p. p. Throbbed; p. pr. & vb. n.
   Throbbing.] [OE. [thorn]robben; of uncertain origin; cf.
   Russ. trepete a trembling, and E. trepidation.]
   To beat, or pulsate, with more than usual force or rapidity;
   to beat in consequence of agitation; to palpitate; -- said of
   the heart, pulse, etc.
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         My heart
         Throbs to know one thing.                --Shak.
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         Here may his head lie on my throbbing breast. --Shak.
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