nag at Meaning If someone is being nagged at by a fear, a do | English Language

nag at

Meaning
If someone is being nagged at by a fear, a doubt or a regret, they can't stop thinking about it.

For example

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.

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