DEATH-
https://en.m.wikipedia.org/wiki/VF-101
https://en.m.wikipedia.org/wiki/Symbols_of_death
https://en.m.wikipedia.org/wiki/Symbols_of_death
https://en.m.wikipedia.org/wiki/List_of_expressions_related_to_death

Phrases-

To go to Davy Jone's locker

Killed in action (KIA) 

Six feet under/to sleep with the fishes