名詞 blackmail:

1. extortion of money by threats to divulge discrediting information

動詞 blackmail:

1. exert pressure on someone through threats
   同義詞：blackjack, pressure
2. obtain through threats

1. It's a clear case of blackmail!
   這顯然是敲詐！
2. He can be ruthless in getting what he wants, but I believe he would stop short of blackmail.
   他這個人為達(dá)到目的是心黑手辣的，但我認(rèn)為他還不至於使用敲詐手段。
3. She was sent to prison for blackmail.
   因犯敲詐勒索罪她被送進(jìn)監(jiān)牢。

black.mail

n.（名詞）

Extortion of money or something else of value from a person by the threat of exposing a criminal act or discreditable information.
黑函，敲詐函：通過揭露犯罪行為或提供不可信資料等手段威脅強(qiáng)索某人錢財或值錢之物
Something of value extorted in this manner.
勒索之物：通過此種手段強(qiáng)取的有價值之物
Tribute formerly paid to freebooters along the Scottish border for protection from pillage.
勒索貢物：從前為防止海盜搶劫，沿蘇格蘭邊境向海盜上貢之物

來源：
black
black
mail 3
mail3

【引伸】
black.mail.
v.（動詞）
black.mail.er
n.（名詞）