The Collaborative International Dictionary of English v.0.48:

jeopardize \jeop"ard*ize\, v. t. [imp. & p. p. Jeopardized; p.
   pr. & vb. n. Jeopardizing.]
   To expose to loss or injury; to risk.

   Syn: jeopard.
        [1913 Webster]

              That he should jeopardize his willful head
              Only for spite at me.               --H. Taylor.
        [1913 Webster]