1) Exist 2) Expose to injury 3) Expose to peril 4) Imperil 5) Jeopardise 6) Jeopardize 7) Menace 8) Peril 9) Place in jeopardy 10) Pose a threat to 11) Present a danger to 12) Put at risk 13) Put in peril 14) Put on the line 15) Risk 16) Risk harm to 17) Threaten 18) To expose to danger 19) To incur the hazard of 1) Imperil 2) Jeopardise 3) Jeopardize 4) Menace 5) Risk 6) Threaten 
• (v. t.) To put to hazard; to bring into danger or peril; to expose to loss or injury; as, to endanger life or peace. • (v. t.) To incur the hazard of; to risk.
En·dan'ger transitive verb [ imperfect & past participle Endangered ; present participle & verbal noun Endangering .] 1. To put to hazard; to bring into danger or peril; to expose to loss or injury; as, to endanger life or...
[v] - pose a threat to
jeopardize verb pose a threat to; present a danger to; `The pollution is endangering the crops`
to expose to danger; imperil: It was foolish to endanger your life in that way.