The prefix "en-" in the words "enable" and "endanger" generally means "to cause to be" or "to make."
- In "enable," it means to cause someone or something to be able to do something.
- In "endanger," it means to put someone or something in a situation where danger is possible, or to make something vulnerable to danger.
So, the correct related meaning for the prefix "en-" in these contexts is "to cause to be."