1. endanger, imperil, put at risk, place in danger; compromise the safety or security of; compromise the success of (also jeopardise). jeopardizejeopard*ize , v. t. [imp. & p. p. jeopardized ; p. pr. & vb. n. jeopardizing .] to expose to loss or injury; to risk; to jeopard. that he should jeopardize his willful head only for spite at me. taylor.jeopardize v