dagger [ˈdægə(r)]

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n.匕首，短剑，剑号

a short pointed knife which is sharp on both sides , used especially in the past as a weapon

The bad news is a dagger to his heart. 这条坏消息刺痛了他的心。
The murderer thrust a dagger into her heart. 凶手将匕首刺进她的心脏。