The phrase "to notice the difference" means to recognize or perceive a distinction between two things, people, events, or situations. It implies paying attention and being aware of small details that make something unique or different from others.
Sentences with «to notice the difference»
You don't notice any difference in how you look from one day to the next. (religion.blogs.cnn.com)
If you don't notice a difference in how you feel, email me personally within 60 days of your purchase and I'll make sure your money is promptly refunded. (purefoodcompany.com)
You don't really notice a difference between the two when they're packed into these little bites. (homemadeupgrade.com)