menace

(noun) something that is a source of danger. Synonyms: threat. Example: "Earthquakes are a constant threat in japan."

(noun) a threat or the act of threatening. Example: "He spoke with desperate menace."

(verb) pose a threat to; present a danger to. Synonyms: endanger, jeopardize, jeopardise, threaten, imperil, peril. Example: "The pollution is endangering the crops."

(verb) express a threat either by an utterance or a gesture. Example: "He menaced the bank manager with a stick."

(verb) act in a threatening manner. Example: "A menacing person."