If someone is “living paycheck to paycheck” it means they never save any money. They keep spending all the money they earn. For example, if you earn $1000 USD per month and you spend $1000 USD per month, you are living paycheck to paycheck.
“Living paycheck to paycheck” is a very common situation all over the world. It’s a very common and useful phrase in spoken English as well. If you are currently “living paycheck to paycheck” I would advise you to stop spending money on “useless things” and start investing money in yourself. Maybe you need to improve your English so you can earn more money in your job by getting a raise. That is just one example. If you earn more money, you can improve your lifestyle AND start saving money! Then you won’t need to live paycheck to paycheck any more!
