run out at (someone or something)
To run directly toward someone or something from out of some place or thing, especially in an aggressive manner. The shopkeeper ran out at the man spraying graffiti on his store, threatening to call the police on him. The dog ran at the mail truck as it passed by his owners' house.
run out at someone or something
to come out of a place and charge or attack someone or something. The badger ran out at us and then went back to its den. The dogs ran out at the speeding car.