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letter bomb

noun
🔊/ˈletə bɒm/
🔊/ˈletər bɑːm/
(North American English also mail bomb)
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  1. a small bomb that is sent to somebody hidden in a letter that explodes when the envelope is opened 书信炸弹（匿藏在书信中，开封即爆炸）see also parcel bombTopics War and conflictc2