acqu is someone whom you first met or someone who is a friend of a friend.

a friend is someone whom you known for a period of time, where you can share some of your private thoughts and someone you can trust to a ..

healthy degree.

That's the general idea.

Close Friend or Best Friend would be someone whom you have been through a difficult or painful period together, as both of you make ...

certain sacrifices for each other and a bond of brotherhood or sisterhood or family is forged. Strong as Steel and Flexible as Flex-metals.

(you can google flex-metals)