Here are some ways to understand the meaning:
* Fairness: It suggests that both sides should contribute something to a relationship, partnership, or negotiation. No one should be expected to give without expecting anything back.
* Balance: It emphasizes the importance of maintaining a balance in giving and receiving. You should not be overly generous without expecting something in return, and you shouldn't be overly demanding without offering something in return.
* Negotiation: It can be used in contexts where people are trying to reach an agreement. Each party needs to be willing to compromise and offer something in order to get something in return.
Example:
"If you want your boss to trust you with more responsibility, you need to give some, get some. Be willing to put in extra effort and show initiative, and then you can expect to be rewarded with more opportunities."
Note: While this idiom is often used in a positive way, it can sometimes have a slightly negative connotation, suggesting that people are only motivated by their own self-interest. It's important to use it carefully and to make sure the context is appropriate.