scowl at (someone or something)
To contort one's face into an expression of anger, disdain, or disapproval at and because of someone or something. I always make a point of waving to my neighbor each morning, but all he ever does is scowl at me from his porch. The boss scowled at the financial reports for the most recent fiscal quarter.
scowl at someone or something
to make a frown of disapproval or displeasure at someone or something. Why are you scowling at me? I didn't do anything wrong! Mary scowled at her noisy cat.