(transitive) To put (someone or something) in danger; to risk causing harm to.
1593, William Shakespeare, Two Gentlemen of VeronaI hold him but a fool that will endanger His body a duel for a girl that loves him not
BurkeAll the other difficulties of his reign only exercised without endangering him.
1877, Louisa May Alcott, Under the LilacsIf you endanger other people's life and liberty in your pursuit of happiness, I shall have to confiscate your arms, boys.
(obsolete, transitive) To incur the hazard of; to risk; to run the risk of.
Francis BaconHe that turneth the humours back ... endangereth malign ulcers.