1. (

• endanger ,
• jeopardize ,
• jeopardise ,
• menace ,
• threaten ,
• imperil ,
• peril

) pose a threat to; present a danger to; "The pollution is endangering the crops" ;

2. (

• menace

) express a threat either by an utterance or a gesture; "he menaced the bank manager with a stick" ;

3. (

• menace

) act in a threatening manner; "A menacing person" ;