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Killer = Excellent,outstanding
很棒，非常好，

Have you tried the burgers at that restaurant? They are killer.
你尝过那家馆子的汉堡没？太棒了！

Man!The movie we saw last night was killer.
我的天呐！我们昨晚看的电影真是太棒了！

kill v. 让某人捧腹大笑

He's really a good comedian and almost killed me.
他真的是个很好的喜剧演员，几乎快笑死我了。

kill time打发时间

I like to kill time by watching American TV shows.
我喜欢通过看美剧去打发时间。

Curiosity killed the cat.
好奇害死猫。

Kill two birds with one stone.
一箭双雕。