What does cousin mean?

Cousin is that kind of intimate relationship, just like boyfriend and girlfriend. But not boyfriend and girlfriend. A little ambiguous.

1, (attitude, intention) vague; I don't understand.

2. (behavior) is not bright; Keep a secret.

3. The physical relationship between men and women or the same sex is still imaginary.

4. The relationship between men and women or the same sex has not yet developed into a lover relationship, but the behavior is similar to a lover relationship.