bomb ‧ shell /ˈbɒmʃel $ ˈbɑːm-/ BrE AmE noun [countable]
1 . an unexpected and very shocking piece of news:
Then came the bombshell: the factory was to close down.
Finally, she dropped the bombshell. She was pregnant, she said.
2 . blonde bombshell humorous a sexually attractive woman with light-coloured hair