Final answer:
Getting the green light means receiving approval, and in the case of having a party, it means you need both of your parents' consent. The idiom applies to various life situations where permission is required to proceed.
Step-by-step explanation:
To get the green light means to receive permission or approval to proceed with some action or task. In the context of your question, it implies that you need the consent of both of your parents before you can go ahead and organize a party. This idiom can be applied to various situations, such as a business project, a creative endeavor, or personal plans like attending a social event.
For example, if you're planning to go to the movies tonight, you'll need to decide whether that or attending a party tomorrow is more important to you, as you can't do both. If your parents have already denied permission for the movie night, that might influence their decision regarding the party. Similarly, if you're hosting friends and have to abide by certain expectations as the host, your parents may want to ensure that you're prepared for the responsibilities that come with having a party at home.
Decision-making with friends can also be tricky, as when splitting a bill at a restaurant. Everyone has to agree on the arrangement to avoid issues, which is analogous to needing both parents' approval to move forward with your plans.