1.  endanger(v = verb.stative) imperil, jeopardise, jeopardize, menace, peril, threaten - pose a threat to; present a danger to; "The pollution is endangering the crops"
is one way to be, exist
Sample sentences: They endanger the animals

2.  endanger(v = verb.communication) expose, peril, queer, scupper - put in a dangerous, disadvantageous, or difficult position;
is one way to affect, bear on, bear upon, impact, touch, touch on
Sample sentences: Somebody ----s something; Somebody ----s somebody; Something ----s somebody; Something ----s something

1.  To put to hazard; to bring into danger or peril; to expose to loss or injury; as, to endanger life or peace. [1913 Webster]
"All the other difficulties of his reign only exercised without endangering him." [1913 Webster]

2.  To incur the hazard of; to risk. [1913 Webster]
"He that turneth the humors back . . . endangereth malign ulcers." [1913 Webster]

endanger, v.tr. place in danger.

Idiom:
endangered species a species in danger of extinction.

Derivative:
endangerment n.

VB  be in danger, be exposed to danger, run into danger, incur danger, encounter danger, run a risk, lay oneself open to, lean on a broken reed, trust to a broken reed, feel the ground sliding from under one, have to run for it, have the chances against one, have the odds against one, face long odds, be in deep trouble, be between a rock and a hard place, hang by a thread, totter, sleep on a volcano, stand on a volcano, sit on a barrel of gunpowder, live in a glass house, bring in danger, place in danger, put in danger, place in jeopardy, put in jeopardy, endanger, expose to danger, imperil, jeopard, jeopardize, compromise, sail too near the wind, adventure, risk, hazard, venture, stake, set at hazard, run the gauntlet, engage in a forlorn hope, threaten danger, run one hard, lay a trap for.