Sure! Let’s break down the phrase "frown on."
"Frown on" is a verb phrase that means to look at something disapprovingly or to think that something is not good or acceptable. When you frown on something, you show that you do not like it or do not approve of it.
"Frown on" specifically refers to disapproval, while "frown" alone can also simply describe the facial expression without the context of disapproval.
While there are no direct idioms that use "frown on," you can use it in phrases such as: - "Look down upon" (which means to regard someone or something as inferior).