The Collaborative International Dictionary of English v.0.48:

Garrote \Gar*rote"\, v. t. [imp. & p. p. Garroted; p. pr. &
   vb. n. Garroting.]
   To strangle with the garrote; hence, to seize by the throat,
   from behind, with a view to strangle and rob.
   [1913 Webster]