letter bomb
noun
Definition of letter bomb
: an explosive device concealed in an envelope and mailed to the intended victim
From the M-W Editors
First Known Use of letter bomb
1882
LETTER BOMB Defined for English Language Learners
letter bomb
noun
Definition of letter bomb for English Language Learners
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: a bomb that is mailed to someone in a letter or package and that explodes when the letter or package is opened
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