Makruh is kind of like when your teacher tells you not to do something, but it's not really a rule. It's more like a suggestion that you should follow.
For example, your teacher might say it's makruh to eat junk food during class time. This doesn't mean you'll be in trouble if you do it, but your teacher thinks it's not a good idea if you want to learn and concentrate in class.
Makruh is a term used in Islam that means something is disliked or discouraged, but it's not actually forbidden like haram. It's not something that Allah will punish you for, but it's always better to avoid it if possible.
So, when you hear someone say something is makruh in Islam, it means that it's not a sin, but it's better if you don't do it. It's like your teacher suggesting you eat healthy food during class time instead of junk food.