threaten/ 'θrεtn /

1.vi.[storm] [ danger+] 
似将发生

2.vt.[+person] 
(make a threat against) 威胁

3.vt.[+life] [ livelihood etc] 
(endanger) 使受到威胁

to threaten sb with a knife/gun
用刀/枪威胁某人
to be threatened with imprisonment/extinction
受到监禁/覆灭的威胁
to threaten to do sth
扬言做某事
4.vt.
(seem likely) 可能发生某事