Meaning: If someone is being nagged at by a fear, a doubt or a regret, they can't stop thinking about it.
- nag at Ken lost millions when the stock market collapsed, and the thought that he should have sold his shares when they started going down kept nagging at him.
- nag at The feeling that she'd left it too late to have children was nagging at her.
nag at: fear, doubt, worry, regret, guilt, thought
The thought of losing his job was nagging at Bill. He