worry at
phrasal verbPart ofworry
worry at — phrasal verb
1. to keep pulling or touching something with your hands or teeth; or to keep think
1.phrasal verb
Definition
to keep pulling or touching something with your hands or teeth; or to keep thinking about a problem without finding a solution
Example
The puppy sat on the rug and worried at an old slipper until it fell apart.
Aarav worried at the problem for hours but could not figure out why the computer crashed.