Nag Fear Regret Thought Nagging Meaning Nagged Doubt

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.
  
  

Nouns often used as subjects with nag at: fear, doubt, worry, regret, guilt, thought