This is the 13744th most frequent German word.
entern
"Entern" means "to board (a ship) during an attack."
In this context, 'entern' refers to boarding or gaining command of a ship.
Die Piraten planten, das Handelsschiff zu entern.
The pirates planned to board the merchant ship.
Here, 'entern' metaphorically means to conquer or take control of a new domain or territory.
Die Abenteurer beschlossen, eine neue Welt zu entern.
The adventurers decided to conquer a new world.
In this imaginative context, 'entern' is used to describe the action of climbing into or onto something, likening it to pirate behavior of taking over.