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.
Throbs to know one thing. --Shak.
Here may his head lie on my throbbing breast. --Shak.