zmarszczyć brwi in English:

A frown may express anger or displeasure.

She frowned with concentration

Don't frown, it spoils your pretty face

He was listening to me with a frown.

A frown of disapproval

Eli frowned.

The teacher frowned when she saw all the mistakes I had made.

She nodded, then frowned.

In her family, any expression of feeling was frowned upon. She looked up with a puzzled frown on her face.

There was a faint frown on his face, and he swallowed twice, hard.

Mennis asked, frowning.

He put down his book with a slight frown.

An example of frown is the face you make when you are unhappy about something.

You will never see me frown!

The boss seemed to frown on my method.