bombshell UK /ˈbɒmʃɛl/US /ˈbɑmʃɛl/noun 3forms 1phrases 1 noun3 •(historical) Any grenade, mortar shell, or artillery shell (hollow metal object) containing a charge that can explode. •(figurative) Something that is very surprising, shocking, amazing or sensational."This—this is a bombshell!" exclaimed the Colonel. "What does it mean?" "Politics," replied Carrados tersely. — 1923 •(informal) Someone who is very attractive; a sex symbol. formsbombshells Phrases with bombshell drop a bombshellTo announce surprising or alarming information suddenly and without warning.