Synonyms for endanger

imperil, jeopardize, expose to danger, risk, hazard, leave defenseless, leave unprotected, put in danger, put in jeopardy, threaten, subject to loss, make liable to danger, put at risk, expose to hazard, expose to peril, compromise, be careless with, fish in troubled waters*, lay open*, put on the spot*, leave in the middle*.

Antonyms save*, protect, preserve.