run at

run at (someone or something)

1. To run directly toward someone or something, especially in an aggressive manner. The police officer ran at the gunman and wrested the pistol from his hands. The dog began running at the mailman with his fangs bared.
2. To flee or retreat because of some prompt or inciting event. You don't want someone who's going to run at the first sign of danger. Everyone in the street ran at the sound of gunfire.
See also: run
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

run at someone or something

to run toward someone or something; to charge someone or something. The bull started to run at us, but changed its mindthank heavens. The huge crocodile ran at the goat, but the goat leapt away.
See also: run
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also:
References in periodicals archive ?
(If you were to actually perform a 15-minute run at this pace as a test, you would not be running at MHR the entire time.)
He'd run at least 100 miles a week and often get up to about 125 to 130 miles.
The purpose of a warm-up is to prepare your body to run at race pace.
Run at the right time, it can be an effective weapon.
Run at a 5K effort, build the number of repetitions, and run downhill as well as up.
If the fullback's route is run at more than five yards, the flat zone will never be threatened and the defender can simply stay on top and effectively take away both the fullback and the tight end.
Even if you don't usually run at this speed, higher speeds are useful for interval training.
* If you run at night with your dog, add reflective material to his leash and collar.
Because you've described pain only during certain situations, I'm assuming it is not hurting when you run at this point.
These are run at a comfortably hard, near race pace, with a steady, unvarying effort.
I don't compete anymore and am reasonably satisfied to run at a slower pace, but even that has been hard lately.