threaten (
http://definr.com/threaten)
v 1: pose a threat to; present a danger to; "The pollution is
endangering the crops" [syn:
endanger,
jeopardize,
jeopardise,
menace,
imperil,
peril]
2: to utter intentions of injury or punishment against:"He
threatened me when I tried to call the police"
3: to be a menacing indication of something:"The clouds
threaten rain"; "Danger threatens"