The phrase "get a line" can be understood in a few different ways, but it generally means to get information or to understand something. It is often used informally. Here's a detailed explanation to help you:
In more advanced contexts, you might hear "get a line" being used in professional or social situations where someone is trying to gather information about a topic or event.
"Before making a decision, let's get a line on how the team feels about the new project."(This means to gather opinions or information from the team.)
Understanding the phrase "get a line" can help you express how you learn or gather information in everyday conversations.