What does the expression "its a 2 way street" mean?
You gotta give a little to get a little
The expression "it's a two way street" means that an action should be reciprocal for example if some call you and ends the conversation with the expression, it means he expects you to also call him/her.
it means it works both ways, what you do for someone else, it would be reciprocated back to you
There are two sides to every story, meaning there are two opinions