keep something dark
US /kiːp ˈsʌmθɪŋ dɑːrk/
UK /kiːp ˈsʌmθɪŋ dɑːrk/
1.
to keep something secret; to not tell anyone about something
:
•
We need to keep this project dark until the official announcement.
•
She asked me to keep her plans dark from her family.