pull at
definitions
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to tug or pull something gently or repeatedlyen: to tug or pull something gently or repeatedly
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to feel a physical or emotional urge to do somethingen: to feel a physical or emotional urge to do something
examples
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He pulled at the thread to see if it was loose.
He pulled at the thread to see if it was loose.
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She pulled at her hair when she was nervous.
She pulled at her hair when she was nervous.