verb (v)

• pose a threat to; present a danger to(verb.stative)

  Example:
  The pollution is endangering the crops.
  

  Synonym:
  imperil, jeopardise, jeopardize, menace, peril, threaten
  

  source: wordnet30
• put in a dangerous, disadvantageous, or difficult position(verb.communication)

  Synonym:
  expose, peril, queer, scupper
  

  source: wordnet30
• To put to hazard; to bring into danger or peril; to expose to loss or injury; as, to endanger life or peace.(verb)

  source: webster1913