Definition of pick at phrasal verb from the Oxford Advanced American Dictionary

 

pick at

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    pick at something

     
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  1. 1to eat food slowly, taking small amounts or bites because you are not hungry She sat at the table in silence, picking at her dinner.
  2. 2to pull or touch something several times He tried to undo the knot by picking at it with his fingers.
See the Oxford Advanced Learner's Dictionary entry: pick at