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.

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 mind—thank 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.
See also:
  • run at (someone or something)
  • wrest (someone or something) out of (someone or something)
  • flush out of some place
  • la
  • à la
  • breeze past (someone or something)
  • wrest out
  • an old shoe
  • be able to (do something) in (one's) sleep
  • be able to do something in your sleep
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.)
Proper training pace
He'd run at least 100 miles a week and often get up to about 125 to 130 miles.
Running wild. (Here Below)
The purpose of a warm-up is to prepare your body to run at race pace.
Race day strategy
Run at the right time, it can be an effective weapon.
A Little Speed Series That Will Spice Up Your Wing-T!
Run at a 5K effort, build the number of repetitions, and run downhill as well as up.
The Clinic
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.
Keep your "I" on the off-tackle power play!
Even if you don't usually run at this speed, higher speeds are useful for interval training.
The Clinic
* If you run at night with your dog, add reflective material to his leash and collar.
4-legged runners
Because you've described pain only during certain situations, I'm assuming it is not hurting when you run at this point.
The clinic
These are run at a comfortably hard, near race pace, with a steady, unvarying effort.
How to estimate your Lactate Threshold pace
I don't compete anymore and am reasonably satisfied to run at a slower pace, but even that has been hard lately.
The Clinic