menace (
http://definr.com/menace)
n 1: something that is a source of danger; "earthquakes are a
constant threat in Japan" [syn:
threat]
2: a threat or the act of threatening; "he spoke with desperate
menace"
v 1: pose a threat to; present a danger to; "The pollution is
endangering the crops" [syn:
endanger,
jeopardize,
jeopardise,
threaten,
imperil,
peril]
2: express a threat either by an utterance or a gesture; "he
menaced the bank manager with a stick"
3: act in a threatening manner; "A menacing person"