i Register
In some senses, endanger is marked as obsolete. Watch for register when choosing this word.
verb
To put (someone or something) in danger; to risk causing harm to.
I hold him but a fool that will endanger / His body [in a duel] for a girl that loves him not
All the other difficulties of his reign only exercised without endangering him.
To incur the hazard of; to risk; to run the risk of.
He that turneth the humours back […] endangereth malign ulcers.