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Definition of mail bomb noun from the Oxford Advanced Learner's Dictionary

mail bomb

noun
 
/ˈmeɪl bɒm/
 
/ˈmeɪl bɑːm/
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  1. (North American English)
    (also letter bomb British and North American English)
    a small bomb that is sent to somebody hidden in a letter that explodes when the envelope is opened
  2. an extremely large number of email messages that are sent to somebody
See mail bomb in the Oxford Advanced American Dictionary

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