If you have heard this phrase before you may or may not know what it means. But let me explain this to you. Because hustling has many different meanings. The one I am talking about is people who are putting in the work to achieve their goals.
When you are a person who puts in the time to achieve your set goals then you are hustling. Because you can sit and think about what it would be like to achieve the goal or work and get it done. So you do not want to knock or in other words dampen their progress.