When someone says, "I'm going to take you down a few notches," it means they intend to bring you down or humble you by diminishing your pride, ego, or confidence. The phrase implies that they believe you have become overly arrogant, boastful, or self-assured, and they want to challenge or confront that attitude.
Taking someone down a few notches typically involves pointing out their flaws, mistakes, or shortcomings to make them more aware of their limitations or to show them that they are not as superior as they may think. The purpose is to bring the person back to a more modest or grounded state and to discourage any behavior seen as overly confident or cocky.
It's worth noting that using this phrase in a conversation can come across as confrontational or critical, so it's essential to be cautious about how and when it's used. In some cases, it may be better to address the issue constructively and respectfully rather than resorting to language that could escalate tensions.