bombshell
My sister dropped a bombshell by announcing she was leaving her job.我姐姐宣布她要辞职，这让大家大吃一惊。
He dropped the bombshell that he was going to spend Christmas with his girlfriend and not his parents.
My dad kept his financial dealings very private until this week, when he dropped the bombshell that he has run out of money.
I remember the moment she dropped her bombshell vividly.

SMART Vocabulary: related words and phrases

Information and messages
advance notice
advance warning
advertisement
aide-mémoire
ammunition
bumper sticker
credential
flier
guideline
handout
info
infodemic
push notification
radiogram
readout
relabel
subtlety
telemetry
the gory detailsidiom
the real deal