to have a worried or distressed look on one's face; to pull a long face; to frown with a miserable expression

Describes a person's appearance when they are deeply worried or distressed; literally, to have one's eyebrows knitted in a frown that will not relax.

To have a look of deep sorrow or worry, literally with knitted eyebrows and a miserable face

A look of deep sorrow or distress, characterized by furrowed brows and a pained facial expression; having a miserable look.