Today’s phrasal verb is “frown on” and it is used when we want to talk about when someone disapproves of something. In other words, when someone thinks a certain situation is not a good way to live. For example:
My mother frowns on couples who live together before marriage.
I used to frown on drinking alcohol, but now I sometimes like to drink.
A: Don’t your parents frown on you being a rock musician?
B: No, they think it’s cool.
This expression is a little formal but not extremely.