手て紙がみ爆ばく弾だんてがみばくだんMeanings1nounletter bombAn explosive device concealed in a letter or parcel, designed to detonate when opened.郵ゆう便びん局きょくで手て紙がみ爆ばく弾だんが見みつかった。A letter bomb was found at the post office.
