Question

What is a metaphor for friend ship

Answer 1

A friend is a treasure, once you find it be grateful for it as if you could lose it at any moment.

Answer 2

One of my personal favorites is..
Friends are like, blood, you don't always see them, but they always come out when you are wounded.
or
Friendship is like peeing on yourself, everyone can see it, but only you get the warm feeling it brings.