Bless God and die
Here’s what it means
A euphemistic wording that almost certainly means 'curse God and die'.
Why the Bible says it this way
Biblical scribes and speakers sometimes used 'bless' in a context where directly writing or saying 'curse God' was avoided.
The Bible sometimes uses gentler words for a private or sensitive subject.
A helpful detail: Translations normally render the intended meaning 'curse.'.