1. The essential point or the most important fact: This is the most common usage. It's often used to summarize a situation or argument and highlight the key takeaway.
* Example: "The bottom line is that we need to increase sales by 10% to meet our target."
2. Profit or financial outcome: This meaning is more specific to business and finance.
* Example: "The bottom line was impacted by the recent economic downturn."
In both cases, the "bottom line" implies a conclusion or the end result. It's a way of saying "what matters most," "what's important," or "the final outcome."