drop a bombshell
US /drɑp ə ˈbɑmˌʃɛl/
UK /drɑp ə ˈbɑmˌʃɛl/

1.
soltar una bomba, dar una noticia impactante
to announce a very surprising piece of news
:
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The CEO decided to drop a bombshell at the board meeting, announcing his immediate resignation.
El CEO decidió soltar una bomba en la reunión de la junta, anunciando su renuncia inmediata.
•
She didn't want to drop a bombshell right before the holidays, so she waited until January to tell them she was moving.
No quería soltar una bomba justo antes de las vacaciones, así que esperó hasta enero para decirles que se mudaba.