letter bomb 【法】 书信炸弹, 邮件爆炸物
letter bomb[ noun ]- a thin explosive device inside an envelope or package and detonated when opened
<noun.artifact>
[ verb ]- send an explosive to
<verb.competition>
The Unabomber letter bombed a number of individuals and institutions
letter bomb \let"ter bomb`\, letter-bomb \let"ter-bomb`\n.
A bomb disguised as a letter and sent through the mail,
usually rigged to explode and kill or harm the recipient when
opened.
[WordNet 1.5]